To be fair, is there really any solid rationale of having any type of rapid transit out to Conlins Rd, aside from maybe improved bus service? The ridership on any line out there (be it subway or even LRT) is going to be piss poor.
All Sheppard east of McCowan needs is improved bus service, anything else is overkill. 3,500 pphpd in 2031 at the western section of line isn't really a ringing endorsement for spending nearly a billion dollars on an LRT. What is the peak period ridership going to be around McCowan, 1,500 pphpd? If that? What's the ridership going to be at Morningside, 200 pphpd?
I realize that the ends of any line are going to get less ridership than the busiest sections (pretty much by definition), but when the ridership near the end of the line is a rounding error away from 0 in the grand scheme of things, it isn't worth it.