Definitely support this. Hear you on the concerns about newbies rushing in and going BK, then that has to be just another of the many learning curves for newbies... we can't go making the game work along the lines of what newbies need i.m.o. 
While I agree that we don't have to make a game
for the newbies, we also don't have to make a game
against the newbies. So if some negative aspect can easily be avoided, why not do so?
In my opinion, the fact to limit the growth of the purchase limit to privately listed a/c already helps. Because in this case they need to take action, to cut a deal, and we can hope that the seller/lessor would be kind enough to tell the guy he's making a mistake.
Plus, no one likes when ones planes return after two years with 65% condition.