They should perhaps consider a 5 map pool (2 bans) instead of 7/3. It would in theory reduce variation, which would lead to less altf4, which would in fact increase variation.
People like to know what they are doing and the introduction of 3-4 new maps every 3 weeks creates too much uncertainty, so players stick to Arabia or Arena where they are comfortable. Having to learn one map per rotation I believe would make players more open to it than 3-4. You would also see the same maps more frequently which creates more opportunity for learning.
Hybrid (Four Lakes, Golden Swamp, Baltic, etc)
Land (Hideout, Serengetti, Oasis, etc)
Gimmick (MR, Nomad)
Quitting for not liking the map is most likely a team game issue. If it is done by a 1v1, then it is most likely a smurf that wants to drop his rating and it isnt done at when the map is picked, but when the game is started.
Most non fixed maps are pretty much repeated over and over again. All 5 non fixed maps in this voting have made an appearance in a previous map pool. It is not like all 5 maps are completely new every week.
Also new maps arent completely different compared to other maps. There is just a set of strategy that work on almost every open map or almost every closed map. So having to learn 3-4 maps every 2 weeks is a bit over the top.