YRT is in an unfortunate situation where in a lot of places it HAS to act like an extension of the TTC in York Region (i.e. link to subway routes in Toronto), but cannot attract riders feasibly because of the double-fare. I feel confident enough to say that if the double fare was eliminated on YRT routes that headed to finch/ downsview, every single YRT bus at current frequencies would be packed to the brim. People will put up with a lot of inconvenience for transit (i.e longer waits or ONE higher fare) but hardly anybody will choose to wait longer AND pay a double fare to add insult to injury.
There really aren't that many POI's or destinations within Southern York Region. Youv'e got the typical movie plazas and some malls, but in general, if people are looking for entertainment they're usually focused on going down to Toronto from York Region. If a co-fare deal "a la GO Transit" was adopted (something like $1 extra on-top of the already $3.25 fare for the YRT if transferring to TTC) I think this would benefit YRT tremendously, although I'll be honest, I'm not sure what the TTC has to gain from it.
It's just very frustrating when everyone knows what the issue is and how to fix it, but that the politics behind the bureaucratic backlog of fare integration is holding stuff back. Sometimes I feel like Torontonians misinterpret Suburbanites when they see us refusing to pay a double-fare even though we live further. Suburbanites don't mind paying MORE to get downtown, what we have a problem with is paying DOUBLE when we only live 500m north of Steeles (in some cases) or only a few KMs north.
/rant