Yes, the Vault is coming...
No, they will never Vault Tron...
Who cares. Tron is a great game. While I owned one for 7 years, the value went up and down. It was funny how I’d see some ads for NIB games, and then a new run (Vaults used to be called “another run”). The price would drop, then slowly climb back up. Meanwhile I’d be happily playing my Tron. That was repeated a few times, but by then the price of the new one was higher. And then Tron went way up, and I never cared, because I was playing Tron. But then it happened, I kind of stopped playing Tron after 7 years, and moved on. My Tron left a couple months ago, and the new owner is playing it like I used to.
My point is that if you want a Tron, get a Tron. Nobody here knows if it will be Vaulted sooner or later. We can’t make the decision any easier. And if a Vault hits and drops the value, who cares. You will be happily playing a game you have wanted for a long time. And then years from now when you’re done, the value will probably be back up. All the while you will be having fun.