I haven't see any indication that people will be able to get a one-seat ride from STC to downtown.
??? They wouldn't even if Bloor-Danforth was extended to Sheppard & McCowan. They'd still have to transfer at Bloor-Yonge. If Eglinton is a thru-line, it just changes the transfer location from Bloor-Yonge to Eglinton-Yonge.
The key to all of it though is elevating Eglinton East for a 100% grade-separated rapid transit line, which is mainly what I'm advocating for now. It's a much more realistic request at this point.