Please note that the area around Don Mills south of Steeles is densely populated, and the large majority of LRT users will come from there rather than from VIVA. Especially with DRL East in place, many residents will like a one-seat LRT ride to DRL terminus at Eglinton.
if it is bad to chop Finch East, then how is it OK to chop Don Mills?
It's not warranted and too costly for the ridership it'll fetch. When you say south of Steeles, you really mean south of Finch which already has an overlapping of two local routes (10 and 25) plus VIVA Green. Truncating the bus route in fact means north of Sheppard service will run more frequently and without the long layovers at DM Stn that have become customary for the 25 bus. Don Mills (Fairview) Stn is the major transfer point, it's a good location to split the service. Think about it: Sheppard subway, SELRT, possible BRT along the DVP and partially grade-separated light-rail south of Sheppard along Don Mills would all converge at this point. Don Mills LRT doesn't target directly the major trip-generator in this area, Seneca College, meaning that northern expansion should follow the DVP, not Don Mills proper. Additional stations at Gordon Baker/McNicoll and Woodbine/Steeles would capture some major employment centres along the way. And just as the Hwy 400 curves westwards at Steeles so too could the LRT line, providing for a station north of Steeles at the Shops at Steeles Shopping Centre. If York Region then desires it, the line could continue up Leslie St to Hwy 7 then overlap with VIVA Purple til Warden before running via Apple Creek Blvd into the downtowns of Markham Town Ctr and Unionville.
Even if the LRT runs all the way to Steeles, VIVA buses will continue running to Don Mills Stn, unless and until they are converted to LRT. So, LRT is not an obstacle for VIVA Green. (Btw, VIVA only uses Don Mills between Sheppard and Finch, then it crosses 404 and uses Gordon Baker.)
Which is redundant overlapping of mass transit within a kilometre of each other. If the market for DMLRT north of Finch isn't primarily going to be tranferees from York Region, then there is no market. North of Finch isn't the high demand section of the Don Mills bus, it's south of the 401. Many times I've transferred at Finch onto the 25A and in most cases only handfuls of people were on-board already.
I understand that Don Mills LRT may not be in the priority list, but when it is built, it should go to Steeles at least.
It could via a more practical alignment, on a guideway paralleling the 404. It has to divert east already to feed into Don Mills Stn so it may as well continue east then north to offer a non-stop express run to Seneca College from the subway.
I totally agree with you about Finch East: breaking up that route is a bad idea. Either keep it as bus, or transform to LRT all at once.
See, this is what sours me about the management of the TTC:
http://lrt.daxack.ca/blog/presentations/2009-06-02_display_boards.pdf
As you can see, on pg. 40 the report the Finch Hydro Corridor is listed as one of the TTC's Higher Order Transit Corridors, not Finch proper, again alluding to the levels of contradictory mixed-messages the TTC gives out to the public regarding where is and isn’t suitable for transit. See we could all at once transform all of Finch into a rapid bus service stretching all the way across the city had the millstone of FWLRT not presented itself. Do commuters rom Scarbrough really need to travel along Finch through North York if they're heading to/from Yonge-Finch subway? Seeing as the TTC has several branches along the route already, the way to make them more practical is to have run as a express limited to non-stop service from Yonge to Don Mills with local service picking up through Scarborough. This non-stop right-of-way is best achievable through the hydro corridor.
I don't why many people here still insist that we have limitless money to spend to extend light-rail lines everywhere mass transit is possibly needed in this city. What allegedly started out as an affordable solution is now running into the $15 billion arena. At least with busways through present non-trafficked corridors, our city is not itself being held at ransom (mass road closures, shops going out-of-business from lack of patronage during construction period, expropriations, etc.) nor are we holding external financiers at ransom (provincial and federal gov't) as BRT is both affordable and can be built in less time with ill-effect. And again, can't stress this enough, they are more easy to convert to light-rail in the future than building LRT from scratch, finding out that demand level for LRT truly wasn't there but by then the money can never be recouped once its spent.