Based on current assumptions:
Last year when UTA briefly stopped the Sandy trains at the Arena Station, it seemed like they were setting that line up to eventually not go to Central Station and continue it to the airport. After much outcry from Sandy riders who wanted to transfer to FrontRunner, they reversed their decision. I could see them changing the route again though, once the N. Temple transfer station was completed. I've never seen anything to indicate that the WVC line will continue past the current Central Pointe station.