Curry still wins it (or should) if the Warriors win the series. Curry will need to have another big game or the Warriors may not win. If the Celtics win, no way Wiggins gets the MVP.
Wiggins has not been more valuable than Curry overall and I am not sure even in Game 5. Wiggins benefits from the defensive attention that Curry gets. If Curry has two more off games, more likely we win the series. Just as likely, Curry has a big game, the Warriors win, and he cements his MVP.
Finals MVP can be a quirky award for sure but Curry has been the man for them all series. If they win, he would deserve the MVP.