The original poster asked if any change brought in by Obama can be permanent. Can say for sure as an "across the board" statement, but can any change be permanent for the individual - you bet.
Obama has previously made it clear that he supports bans on semi-automatics. Let's say he pull's it off. You say "screw him" and don't hand in your now banned semi-auto.
Two years down the track, you get caught with it.
An incoming President can lift the ban, doesn't make any diiference to you, you've got a felony conviction for illegal possession of firearms over your head.
Can what Obama want's to do to gun owners be permanent, for the individual gun owner, yes.
And another thing to remember, Obama assures anyone who will listen he supports law abiding gun owners, he neglects to mention, if he's President, he get's to define "law abiding". You got a carry permit and Obama make them illegal, guess what, according to him, you're not a "law abiding" gun owner anymore.
Seen it all before, I'm an Australian