I think it is fairly evident that the Infinity Gauntlet will be used to make a few tweaks to the MCU. If anything, it provides an opening for mutants, the X-Men, and Fantastic Four to now be brought into the mix.
Even if is used to create a sort of "happily-ever-after" type ending for the 4th Avengers film, that can be used as a construct to create aftershocks that lead into the potential of Secret Wars, rise of Kang the Conqueror, Dr. Doom, Galactus, etc. All kinds of things become possible as a consequence of whatever happens.
It's not like the MCU is ending with the arc of Infinity War. So I'm ok if/when everyone gets restored, or other characters resurrected like Quick Silver. So long as the stories continue and new threats arise as a result of the "happy" ending, I'm good. Some consequences can be greater than just character A or B simply stays dead.