Transit use is still below pre-pandemic levels. Investments like this is to grow ridership, not maintain levels. That's why we invest in it when ridership is down.
To be fair, this is true for the TTC and GO; but Durham, Brampton and Mississauga are all at or above pre-pandemic ridership. I would argue that this is a function of reduced commuting to downtown, mostly on Mondays and Fridays, and of lower levels of service by both agencies than pre-pandemic. particularly GO.
Fare by distance isn't the intent for most of the GTA's transit operators.
Fare by distance exists with GO, and by default existed where inter-agency/border-crossing trips cost more money. I agree it was not the pricing model for any agency except GO and effects/effected a comparatively small portion of trips, in terms of those that will now see a lower price point.
But I think
@crs1026 point was simply that we don't want to encourage people to live very long distances from work or subsidize sprawl. I think that's a fair point, while noting that I don't expect this level of fare integration to really do either.
I think the more substantial shifts may occur if, as I expect, there is a move to consolidate GO fare zones at lower price points, in line with the BoT idea. For example, where GO treats the entire City of Toronto as one Zone, for which you only pay the base fare; does the same roughly in line w/regional boundaries, with that and a slightly lower base fare, having the effect of lower long-distance commute prices.
I happen to think this is a good thing, up to a point, particularly if we get travel times down. It allows people to access a greater range of jobs, housing, schools, hospitals etc at a more affordable price. But we don't want to see a $4 fare from Kitchener to Toronto, where this ends up not only inducing sprawl, but seeing more people with 60 minute plus commutes.