Heavily modify it, outright removing it would just appear lazy and further homogenize gameplay.
I'm in favour of abandon if it is killed in a base sector or killed with 2 critical already applied. They could also make you pay 50% the vehicle's cost for "refit" before you can use it again.
I like that abandon could be a deterrent to base rushing, especially with early units like the Flamer M3 or Kubelspam, but also with end-game units trying to achieve an annihilation victory.
