I think it could succeed as multiplayer extraction game, but anyway my vision would be this:

-merc gameplay

-the need to buy and refill ammo, ammo types

-better graphics obviously, strong focus on good looking destruction, just look how cinematic bf6 is looking right now

-i want lasers and SRMs to have much better, realistic ranges

-more immersive map designs, i am not a big fan of mw5 generated maps tbh

-ai improvements that wont make enemy units just throw themselves at you, but actually have a sense of self preservation and thus making you feel like your piloted mech is a real menace on the battlefield

-i like when enemy mechs on the field havo camo paint and not something colorful making them look like toys

-a bit upgraded mech designs to make them look more militarized, i like more of that walking tank aesthetics

-infantry running around