Kind of similar to Finch, at Science Centre station, at least riders will get the chance to get on a train (before it's filled to crush load). At Pape, they might face a similar situation as Bloor-Yonge.It wasn't a good projection at all. That assumes that riders do stay on the LRT oppose to transferring at Kennedy. It sounds fine till riders realize they would have to stand in crush load for 15 minutes instead of 5 if they got on at Bloor. That doesn't sound comfortable and thus the ridership wouldn't have reach 12k. Just as TTC has once predicted a lot more people would take Line 4 instead of heading to Finch.
Also to point out that it competes with Line 2 and that isn't near capacity. Money is better spent elsewhere. Since Line 5 has a lower capacity, it would be better to keep the unnecessary riders on Line 2 and save the space for those who actually need it (west of Science Centre Station). The Scarborough subway would keep the riders on Line 2 and they could transfer to the Ontario Line at Pape.
Of course everything changes if/when the OL is extended north from Eglinton.