Instead of troops being shot and disappearing,

what if they would be wounded

(after a period of time they would expire like supplies). Wounded trooper would stop advancing towards maproom.
Now, the real fun would kick in with a new vehicle ( or M3 ability) which carried Medics.

A Medic could rescue injured troops and release them after a period of time (like re- arm pad works for planes).

I believe this would, increase the ground war aspect of base captures.
A lot of possibilities with troop involvement, like taking more than one hit on troop before it would expire.

First(or first # of) hits = wound, Second (or _ # of) hits = trooper expires, trooper chute implodes = trooper expires (this way trooper with boots on the ground will have a better chance of survival / finding cover).

Just one of a number of possibilities of making the base capture experience more interesting.