Well the next Avengers movie is Infinity War directed by the Russos, and I'm sure if they really wanted to use Pietro for whatever reason, there's plenty of ways the Infinity Stones could be used to resurrect him.
Its not like Wanda doesn't find ways to resurrect people literally all the time anyway. Its kinda her shtick. Jean Grey dies and comes back from the dead, Wanda kills people/gets people killed and brings them back from the dead..