To open York University Station, I would imagine an operational possibility would be to have a train cross-over north of Finch, and wrong-rail to York. Every other train could use the left or right track.
That's assuming they actually get York U station into a state fit for human habitation. I wouldn't be surprised if Del Duca's aggressive stance is to try to prevent the kind of massive shifting of resources away from the Vaughan stations to York U station that would be required to get that station operational sooner.
Opening to Finch West is the low-hanging fruit for a staged opening, and if they're studying all the possibilities, hopefully they will see that.
I wonder how much "resource shifting" they can even do due to the fact all the stations are different contracts. Seems like a good idea to divvy it up until something like this, eh? I'm interested to see the scenarios they come up with. I don't see much point making big changes if it means, for example...
Scenario A: Entire line opens mid-2017
Revised Scenario: Open to York U in late-2016; rest of stations open mid-2018
I just made that up, clearly, but my point is that I don't think the rest of it should be delayed to get part of it open as a face-saving gesture. I guess it makes sense to get it open at least to York U ASAP but I suspect, even without the track issues, there will be other operational challenges in doing that (the question of the Steeles bus terminal comes to mind).
Honestly, the whole thing makes me shake my head and it does put the fear in one's heart, regarding Scarborough. TTC has to learn when it's time to delegate big projects, I think.
Oh, and on nomenclature, let's not forget the official name is the "Toronto York Spadina Subway Extension", so if you're tired of the "Spadina" name, maybe you can try to make "Toronto-York" or something like that a thing