A legitimate HQ takeover has been needed for a while as the most effective way to currently rescue anybody from police custody is by explosives or crossfire. Other ways involve exploiting through server mechanics, which really ruins the whole experience and gratification of rescuing somebody. I do think that the hostile takeover requirement should be lowered to 2 or 3 armed individuals because having sniper positions when assaulting a HQ is necessary, which will probably be what leads up to a takeover in the first place but having a majority of the attacking force in one location would make it too easy for a single 6.5 to rip through. Don't even get me started on a 7.62. The only way I can see things working out is if somebody can sneak in, starting the takeover and then the respawn timer gets extended for cops and then the rest of the attacking force makes their way in to solidify the takeover and inhibit respawns for a short time.
I think we should also make hostage negotiations for rebels in police custody more of a thing as well.