Since TTC hasn't reveal their plans, it's so pointless to assume. ML has confirm it's TTC who's in charge of fares.
Financially, putting readers at every door makes no sense. This means 8 readers on 76 LRVs totaling 608 readers oppose to 10 stops (4 busy stops) totally 40-60 readers (2 platforms x 2-3 readers). If TTC only installs 4 readers on one side per car, it's still 300 readers and it will be difficult for people to tap when the trains are full). When the line extends westward, the number of vehicles and readers increases significantly more than the number of stops/stations.
Having readers on vehicle allows everyone to jaywalk midblock on and off the platform. TTC, ML and the city will not want that. If TTC enforces tap off on the LRT lines like they will do on the subway, everyone will have to return to the proper platform entrance and will more likely cross at designated areas. Running people are going to get themselves killed, especially by jaywalking or crossing on red on Eglinton which is much more dangerous than the streetcar routes.
I highly don't recommend readers on LRT vehicles for the sakes of safety and reduces service suspensions caused by pedestrian injuries. I hope they consider fencing 10-20m of the ROW from the platform to discourage illegal crossing at the midblock end of the platform. Safety takes priority over similarity with the streetcars. Fare evasion is another issue. I won't go there this time.