Highway 7 will have the rapidway, but not much else along it. Centre St, even without a rapidway, is still the faster, more direct route, half the distance from Bathurst to Yonge.
At Keele, the 77 takes 21 minutes to travel to Yonge a time saving of 4 minutes compared to Viva Orange. Only starting at Vaughan Metropolitan Centre does Viva Orange provide an advantage, taking 29 minutes to get to Yonge while 77 takes 32 minutes. And that is only an advantage assuming riders want to go north along Yonge. If they want to eventualy go south along Yonge, then Viva Orange only provides a speed advantage west of Weston.
It's a similar problem with Viva Purple vs. route 1. Prioritizing Highway 7 over Steeles is bad enough, but they also divert buses off Highway 7 in favour of a lesser corridor, Enterprise, adding 8 minutes to the travel time. So during the midday, depending on the branch, Purple takes either 31 or 39 minutes to get from McCowan to Yonge, while the 1 takes 36 minutes. So on average Purple only provides 1 minute advantage over route 1. But of course that's not taking into account the 63 minute headway of the 1. 63 minutes.
Also compare Purple from McCowan to Yonge to the 101 Dundas Express from Islington to Wolfedale, both 12km. No rapidway along Dundas, no all-door boarding, but the 101 takes 29 minutes to travel that distance, either 2 minutes faster or 10 minutes faster than Viva Purple, thanks to being a straighter route serving fewer stops. Depending on the branch, Viva Purple serves 15 or 16 stops between those two points while 101 Dundas Express only serves 10 stops in-between. Maybe 101 can ignore the minor stops because 1 Dundas has 17 minute service instead of 63 minutes.
They kill the regular YRT service in favour of Viva. Then, instead of taking advantage of the expensive rapidways and stations and POP fare system, they use smaller stop spacing to make up for the regular YRT service they killed. The end result is not much savings in terms of travel time or operating costs from the regular YRT service. The Viva routes also become more isolated due to less regular bus service to connect to.
You can see all over the US they spend massive amount of money on rapid transit and light rail at the expense of the regular bus service and then their ridership declines. YRT is a similar story. Viva Yellow? Wasn't Viva Green wasn't bad enough? Viva should be more than a marketing gimmick. If they focused less on marketing, and more on creating an actual useful system, they would have the ridership to fund more service. Ultimately it is the ridership (fare revenue) that determines the amount of service.