While there's definitely a boom of sorts going on at the moment, that doesn't mean Telltale is in the position to acquire new staff. But what if...? If BTTF and Jurassic Park work out as well as Telltale hopes, then perhaps they can branch out into even more diverse licenses...including first-person adventure games.
If they got a deal with Cyan Worlds, maybe that would mean an online delivery system for Myst that is actually successful. I think CW had the right idea with Uru, but the online multiplayer format just didn't work. By the time they switched to monthly Gametap episodes, it was too late.
But consider this: a new Myst (or Myst-like) game with one or two new Ages every month, co-written by Telltale and Cyan Worlds. Another option is to co-design a new feature-length game, just like how they brought on an external designer for Riven. I could definitely see it working like gangbusters.
...well, I would buy it.