Employment density plays an important role in dictating transit investment. But yes, parts of Eglinton have piss poor density; our valleys/park areas accentuate this. Though Eg also has pockets of very high density (e.g Flemingdon and Thorncliffe). On the whole though, it's an important route worthy of grade separation...Sheppard, not so much.
Sheppard is fringe because at Yonge it's almost 15km from the lake. It's also north of the 401.
Just because you keep calling it a "fringe" does not make it a fringe area. This is not your Toronto from 1965 when Bloor was the main east-west avenue, times have changed and many many people have migrated northerly. I am not saying Sheppard is equal to Bloor but what i am saying is that Sheppard is no longer a fringe either.
Ironically, the initial Sheppard Line traverses through some of the lowest-density stretches along the avenue. Other than the cluster around Yonge...
*Low-density Willowdale, Did not even justify a station
*Bayview was nothing, a site of a mall about to be abandoned
*Leslie was a hospital, an IKEA, and a Canadian Tire warehouse
*Finally at its terminus Don Mills do you see some real density.
Of course all the changed and now each subway stop has become a density hub.
Contrast this to currently dense clusters along Sheppard with no subway.
* Victoria Park Employment Lands
* Warden contains some density but has potential for so much more
* Birchmount is a super-dense Apartment complex cluster similar to Don Mills
* Kennedy is another residental cluster + retail as well
* Agincourt GO Station will be a major interchange after GO All-Day operation.
Then the rest of sheppard is low density...Especially east of McCowan its pure 905. Add to that the proposed Scarborough RT extension to Progress & Sheppard and you have No need for LRT EVER.
If such a low density stretch of Sheppard can transform into what we see today, what will a currently dense stretch of Sheppard look like?