Seems like a costly investment to serve just a few people. It'd be simpler to just install a sign directing metropass holders to the correct entrance.The TTC really needs to add metropass access from the south end of the building. I understand they are phasing out the metropass in favour of Presto, but the move to Presto won't be completed until the end of 2019. All you have to do is stand at those unmanned south gates, and within a few minutes I guarantee someone will arrive holding a metropass and will be completely lost as to how to get down to the Yonge line. Currently you have to walk to the other side of the building and enter through the Sheppard line entrance instead.
With all the condos dwellers who live in the area and use that south entrance... many were taking a shortcut behind Hullmark, which forced management to fence off the area to discourage pedestrians from passing through.