I think they are keeping some of them if they can make them wide enough and long enough for the ramps and the streetcar. I know they just installed new ones on College when they redid the switch at Spadina and College. Most of the smaller ones will probably go unless they serve another purpose as well. Like the one at Main and Gerd does it helps divert traffic out of the way of the streetcar tracks
This is in reference to the recent news articles about the fairly-but-less-recent TTC announcement of the reconstruction, specifically, at College and Bathurst, and College and Bay--certainly not all, or even a majority, of all of them systemwide.
On the 506 route there are, I believe, 5 island platforms. The 2 at Bay are being removed. The
eastbound one at Bathurst is being removed, but the
westbound one will remain and be rebuild longer/wider for the LFLRVs/ramps. The fate of the one at Gerrard and Main is unconfirmed but it seems obvious that it can easily remain, plenty of space for it, just subject to a rebuild.
Many have indeed already been rebuilt, and not removed. College and Spadina, Bathurst and Queen, Bathurst and King, Queen and Spadina, etc. are all nice and ready for LFLRVs. I know they exist on many routes--actually, I think every single streetcar route has at least one or two of them--King/Queen/Roncesvalles, Dundas W/Bloor, Queen/Kingston...not sure if those have been rebuilt or if they will even remain.
On a side note, it has just occurred to me that the 510's frequent detours in the past few months using Spadina-College-Bathurst-Bathurst Station have made use of the short/narrow westbound platform at Bathurst/College...I wonder if they've been servicing the stop? That platform is set back from the light a bit so I guess if an LFLRV pulled all the way up, its rear doors would probably be on the platform while the front ones wouldn't quite be on it but would at least be a bit apart from traffic. I suppose if a wheelchair user wanted to disembark there they'd be out of luck? Interesting edge case...TTC has a habit of not thinking through potential detour routing very well (see nonfunctional automatic switches/transit priority phase lights along Spadina for streetcars turning off the street i.e. at King/Queen, common detour routing).