I think the current perk system is ok, but I would like to see perks reset to zero after a 30 or 90 day period of time. Many of us have so many perks that we could fly 262s for months and not be affected by any loss.
Actually it's not really many. Out of the thousands of AH players in each tour, only a minority of vets has that many perks. And resetting perks after 30 days means the majority of players would never be able to fly a 262 (or drive a King Tiger) at all. Even with 90 days most players would still have a lot of trouble to save up enough perks to fly a jet at standard rates. Or a formation of B-29s. In that case, they may drop any thought of flying mid-ENY planes for better perk gains and just jump into the best non perked low-ENY fighters available, as earning perks simply doesn't make any sense to them anymore.
On the other hand, the few above average player which basically live in the AH arenas will still be able to fly the 262 at the same rate, as only they are able to earn enough perks in the time given.