I've never really been a huge Taylor Hall fan but if he wants to come to Calgary and Treliving gets him on a reasonable deal then why the hell not.
It's not really out of the realm of possibility either, he's from here, he (allegedly) loved being big swinging celebrity dick on the block up in Edmonton, he's looking to expand his playoff success, and we could potentially afford to give him a nice payday. We're also about to spend half a billion on a new state of the art facility to play in. Could definitely see us being an attractive option for him.
Hopefully Tre has a whole team of people much smarter than I am that can work to project what the cap is going to look like for the next ~5 years.
Whether or not he's an attractive option for us is kind of a different matter. We already have a deep LHS LW pool. One of him, Gaudreau, or Tkachuk would have to play on the right side. Plus it does nothing to address the biggest issue for this team which is still the center position, followed by goaltending. In fact a Hall contract likely makes those issues more difficult to address.