More bases= more alternatives for gangs if one base is full.
Competition is the best part of basing, it makes it challenging. And if gangs idle, you can just go in and take it, or use the OP weapons and grenades you people released to do it also. So there's not really a base problem at all. If there are more bases, more gangs will get hours and it makes gangs more active. Eras player count will probably rise as well.