We do need small infantry maps with no or very very limited vehicles. I'd take Pearl Market over Locker or Metro just because you could spawn a couple of MAVs at least (but no more and NO air vehicles at all!!) and there's a ton of verticality on Pearl Market. PM sized for 128 players would be very cool IMO.
I wouldn't mind a Metro or Locker remake eventually but honestly, I'd rather have something like BFV's Operation Underground than a remake of Metro. Op Underground was a bigger map with more room to spread out, more hallways, more good spots for short-range combat (like the bunkroom). OU was a nice take on Metro, I always thought.