No doubt, there are higher priorities for transit than a Whyte Ave Subway right now (and truth be told, as much as I love the idea, I wouldn't support fast-tracking it over the other projects in the oven). But as this decade wraps up, we'll be seeing the completion of the whole Valley Line and the southward extension of the Capital Line (to Heritage Valley North). There's also a good chance that by this point, they'll be starting construction on the Northwest extension to Castle Downs, and the remaining extensions to Desrochers, Gorman and Campbell road might not be far behind in the 2030s. All in all, I think we are on track to fulfill the current vision for LRT in 2040, which means it's good to start brainstorming ideas for where LRT expansion will go after that.
Counterpoint to Whyte Ave not needing a subway: as our city grows to 2 million and the University of Alberta expands enrollment, Whyte Ave, as one of the city's few entertainment districts with a lively bar/nightclub scene, will only get busier and more attractive as its own destination separate from the university, and the inevitable densification of the area won't help. Traffic will keep spiralling out of control without the subway, and a surface tram is out of the question, so the investment into a subway is absolutley worth it.
The psychological impact of having a fast and high-frequency metro-style service is enormous, especially if you're a university student on campus without a car. Regular spontaneous trips TO Whyte Ave become a lot more palatable and that will be a huge boon for all kinds of local businesses. And let's not forget that areas like Capilano, the King's University amd Sherwood Park could all be linked up with such a line, and at that point, the impact on the whole network of adding all of those communities will be staggering. We're talking cross-town trips between suburbs on opposite ends of the Henday for instance (imagine a one-seat ride between Sherwood Park and St. Albert on the Metro Line). The Valley Line also gets opened up to more riders that way through very quick transfers. This could be big, guys.