Counter-argument: With the completion of the Crosstown, those along the Eglinton Corridor can access the UPX at Mount Dennis. Why is it important for the Crosstown to go to Pearson as well?
Also, I want to question the logic of prioritizing the employment at Pearson Airport over the employment at ACC as the right decision. Specifically, I question if whether it would be better for economic growth in the region overall if the (more white-collar) jobs located at the firms in ACC were more accessible to labour pool of Toronto. Pearson Airport is already served by the UPX and 192 Kipling Rocket.
That said, this idea should have some thought towards a greater local connectivity strategy with Pearson Airport. I'm not sure what the future of the Link Train is with the Pearson Transit Hub, but maybe it can serve as a shuttle to the Renforth Gateway.