I'd hate it and I think it would be a terrible move. There are times where you legitimately can't complete the objective and if you're money-fucked, it's better to save. There's also times where you get a bad call and you're told it's B and it's actually A.

There's also a reason why no server implements such a thing, and I have never seen anything like this in over 8 years of CS.

What happens if you're actually attempting to defuse the bomb, and but the Terrorists are good at delaying you? Same thing on CT maps? You're doing the objective, you shouldn't be slayed.