I do not agree with your statement about the current Basing System!
Why? Because first of all I want to make clear every gang has a chance to own a base but if they attack all gangs that are currently on the map what are they gonna expect? of course they would become enemies and to kill enemies easier we make allies so why you guys make so much enemies you should rather just focus on one base and try ur hardest...
The second thing is allies doesnt matter if we go back 2months we know the 2 gangs made an alliance to stand against 4 allies that tried to kill their gang and in the end they won the war against them so dont say its impossible to out run the alliance of some guilds.
Your solution is to close 2 bases and make a rotation but In my opinion that wouldnt be a good Idea because then the allies will just keep ruling the bases. Also making only 3 bases available then the new gangs would have absolutely zero chances against the gangs that are already basing.
Dont think the basing system is broken if u have no experience how to lead a gang(Do not take this Personally)