Before we even start talking about Sudbury, and Timmins there is still lots of space in Pickering, Ajax and Oshawa to be developed. Especially south of the 401 which was industrial at one point and is now vacant. But what we need is not 5 bedroom single holmes, but transit oriented developments. Even if it's on demand transit, and when I say a community there needs to be a grocery store, restaurants, movie theater and schools within a reasonable distance. Not drive 6km to Wallmart and then 2km to Canadian Tire and then another 5km to the doctors office. This is the problem with suburbs today, you need to have a car to get to where you are going. We need to build self sustaining communities such as what is planned where the Yonge subway will end. I believe Innisfil is another example where the station will become the hub. I'm not sure who owns the station properties along the corridor but all of them are perfect candidates to build a community. Kingston, Fallowfield, Belleville, Cobourg. If you built a community on the station property it would make it easier for people from Cobourg to commute to Oshawa, and seeing the prices in the GTA it wouldn't surprise me if living in Oshawa becomes too expensive in the next ten years.
And although VIA is not a commuter based service, it needs to adapt to the current conditions. Station parking lots aren't generating any revenue, but development rights do.
This should be done for all GO stations as well. Look at Old Cummer GO station, post pandemic it's usually half empty. Build condos there so that people can commute to work from their doorstep. Seems like a no brainer.