I already registered my larger craft with the mail-in registration papers since I plan to do some commercial flying, but I am holding off on this process as recommended by the AMA. I do have a few small quads that I fly for fun so I will need to for them.
Hopefully the AMA works it out so you don't need to. Although it seems like what they are fighting for is that AMA members should not have to register on the grounds that they are already members of an organization like the AMA and that they should be able to use their AMA ID to identify their models (like they already suggest you do anyway). So if you're not a member of the AMA, it probably won't matter what they end up getting the FAA to do because it is unlikely that the whole thing will be overturned by their efforts.
Something interesting to think about though is how much this FAA rule would actually benefit the AMA if they can get it modified to where AMA membership can exempt you from the FAA registration process. This would certainly increase both awareness of the AMA for new pilots as well as boost registrations across the board since a lot of people won't want their info publicly searchable in the FAA database.
When you start thinking of this from a political point of view, it would be counter-intuitive for the AMA to fight the registration requirement to have it overturned completely. They seem to be (and I would too if I were them) fighting to exempt their members, which would end up meaning that the general registration requirement would be very good for them as an organization since it would add to the benefits of becoming an AMA member.
If you really read into their messages, they're more along the lines of: this is illegal, so our members should be exempt. Whereas a lot of articles written are simply saying it's illegal so it should be overturned. Again, I'm an AMA member and if I were the AMA leadership team, I would play the same angle, but it's undeniable that it would be more beneficial if the registration requirement sticks and AMA gets an exemption than if it was overturned completely - which is probably the more "right thing to do" if it is technically illegal.
It's one of those things where you're not doing anything wrong, so why not just comply and move on... versus: you're not doing anything wrong, so why should you allow the government to illegally overstep their authority and slowly eat away at your freedom?
The one thing that is certain is that bad guys don't follow rules. If they have to self register and self label their UAV, they won't. If frames start coming with serial numbers, they will scrape them off before they do something bad.
In the end, there is only one solution and that is to educate those with good intentions and defend against those with bad intentions. What the government tends to do though is cripple good people with the burden of useless laws and end up creating a minefield of regulation that turns just about everyone into an unintentional law breaker.
/rant