Priority? no, at least not now. There is a huge list of priorities right now for Larian, and increase the number of players is not one of them I guess.
This is not a game designed to create persistant worlds or servers with 20 players. I would love to see an small increase of maybe 1 or 2 players more (GM + 5/6 players max) but thats all I would ask for a near-perfect game.
Yes, i hink a small increase of 2 players i see very much a priorty. Or at least show how to mod that without giving official support.
A second GM would make it near-perfect for me.