Port Perry only has a population of about 10K.
I do expect that if HxR proceeds, there will be political pressure for a Durham Region stop so that people from the Lakeshore communities heading to Ottawa and Montreal don't have to backtrack all the way to Union Station. But that's a different proposition from thinking that Myrtle would be a potential hub generating ridership from the rural areas to the north.
The previous GO studies were from an era where more development was foreseen, or where people were looking for some way, any way, to get train service to return to Peterboro.
It makes eminent sense for a route running through Peterboro to have a stop there, but building stations and passing points all along that line to serve virtually nobody would be a really poor use of money - and it would create political pressure to change zoning to open up further development - and that's a really bad idea.
It's another case where the romance of a once-upon-a-time 2-car RDC doesn't justify building the infrastructure for a new GO route.
- Paul