I think this metagame will give overlooked pokemon their chance to shine. They may not be able to deal that much damage, but I doubt that will be the main worry at the beginning of the battle. You want to set up as much as you can first, then wait for the lockdown, and then attack.
Permanent Terrain = Gogoat's time to shine.
In all seriousness though, this meta sounds amazing. I am really looking forward to all the weather teams and Trick Room teams. Will Mega Steelix and Giglaith be used on Sand Trick Room teams (not saying its good, just thinking out loud)? What about Mega Garchomp, will it see a rise in usage? How will stall deal without status in the case of Misty Terrain? Trick Room Rampardos and Marowak anyone? I really hope this gets coded soon because I can't wait to play it.