Completely rework it so that it's more durable after it dies to promote fighting for it, but you have to pay a vehicle cost (80%) either to take it or to use it OR it's more durable but comes with multiple devastating critical. In either case, Armour to 11 while abandoned, so that you can destroy it easily as well.
I agree with Dusty that there should a way to make vehicle abandonment a near certainty but is the only method to make it happen. Early pre-release CoH2 press articles once indicated that heavily damaged enemy tanks (representing popped hatches) could be mounted by your own infantry for a risky but deadly attack to punish unsupported tanks. I'd be happy if a busted hatch critical at below 25% tank health allowed infantry to toss in a grenade or something to cause abandonment. It could take a few seconds for the infantry to pull off, and they'd suffer penalties to recieved accuracy and damage while they're at it.
Interesting, I was wondering why the T-34 and KV tanks had interior hatches even though they have no spotter, commander, or gunner upgrades. I assumed Relic just modeled them in just in case they ever wanted to add those.