Put it this way -
At the moment guys will up buffs to run the vulchers ammo out.
Take away the fact you would never be able to shut down a field, it is quite possible that a base could become uncaptureable.
If a large number of guys just keep rolling over and over again eventually the caps gonna get broken.
Or they'll sit in the tower waitnig for a goon to pop into view, then mass roll.
Chances are one will get up.
Even a fully down base isn't a sure thing as you know.
How many times you been sat over a dead field with no goon for miles, or the guy drops his troops too low, or on the field.
HT made field capturing harder by increasing town sizes, adding hangers that never go down could make thing worse.
Why stop there?
Lets have VH's that are never truly down, each 1000lb removes the better GV's.
So you bomb a field to crap, you still have P40's etc coming out of dead FH's, M16s, Jeeps, M3's rolling out of dead VH's.
Lets have CV's that never truly die, you can always roll something off them.
Hell, lets just do any with base captures altogether huh?