I would argue that chances he could "still vulch your arse off" will diminish. I really believe there are side effects that will change the dynamics of a base capture, it will be a rarity to find a capped field that is allowed to have any type of hanger standing for very long.
I think we're talking the lesser of evils here. For the sake of contrast we'll assume people don't already vulch AND often drop FH's, which is far from the truth in reality. For confirmation, just ask everyone who tries to get an Il2 up because only their BH's are left up so the vulchers wouldn't even have the miniscule challenge of having to vulch other fighters...
Which is better...
1) Having hangers stay up but all defenders get pendulum pass vulched the second they spawn...or
2) Have the hangers taken down more often but give defenders the opportunity, at the very least initially, to get up and mount some sort of realistic, reactionary low Alt/E defense.
I would vote for option 2, option 1 leaves no recourse to realistically fight, it really doesn't matter to the defenders if FHs are up or not as they get popped the second they spawn. Option 2, even if only marginally successful provides an opportunity for an actual fight which is a lot more than you can say for option 1 99.9% of the time.
Option 2 would allow the defenders to at least have a chance of intercepting low and/or divebombing heavies. Option 1 leaves no option to protect their strats against heavies at all. So, assuming your are correct and FH's will get prejudicial attention, it will likely be at least partially negated by the fact defenders may be able to destroy low/diving bombers forcing them to go higher, then the high ones will take much longer to get there making keeping FH's down harder. The same would be true for jabo's. If they wanted to keep FH's down, they would all have to come heavy and give up E to divebomb making them more vulnerable to the defenders already up.