No matter the game idea itself, pick any indie MP focused game on Steam and check the player stats.
Indie games without a good marketing idea simply don't get the attention they would need to build a community that keeps the MP part alive. Toxikk? Dead. Ratz Instagib 2? Dead. Epigenesis? Dead. And they never were really alive to start with.
So, let's just ignore that this project is WAY too anticipated for a tiny team, if they focus mainly on multiplayer their base design concept is already flawed.