I think it's less about fitting the new lines above the doors, and more about deciding what gets included and what doesn't. That was an easy decision when the system was fully grade-separated, but it's a lot harder when surface LRT and part-underground/part-surface LRT gets added to the system..
I feel like we're going to go through a few iterations of the new system map. If local streetcar routes (including the 502 & 503 that don't run most of the time) and the airport express bus are being included on the map, why are other express buses being left off? My guess is that by the time the Eglinton LRT is open, it'll be the 504, 509, 510, 512 and the all-day/every-day express bus routes.