The hill at Hogg's Hollow will become less of an issue as
e-bikes get more popular. They make riding uphill feasible for those who don't want to turn an errand or commute by bike into a workout.
Protected lanes are exactly what's needed all the way down Yonge. The new lanes starting around St. Clair are a good start, which will hopefully be built to a more permanent standard in the future and extended to North York. As experience all over the world shows, interconnected networks of separated bike lanes and protected intersections have a big impact on how people can get around. Toronto is only now starting to build protected intersections so we still have a long way to go.
I'm one of those people. North York Centre is going to be much better for biking in the next several years but it's still highly disconnected from much of the city. The 401 and Hogg's Hollow are like a no man's land for bikes. I'd love to be able to bike to, say, a bakery at Yonge and Lawrence for example more easily. It's a trip that's not really worth it by subway with the TTC's stupid fare system but would be pretty easy by bike (especially an e-bike) if we had proper infrastructure.