Reciprocity is next on the chopping block, likely via Chicago.
BUT...
...I also think that the full auto ban, Section 922(o), is going to be challenged. Its effect is virtually identical to that of the DC ban (i.e. if you haven't registered a handgun/full auto by a particular date, then no matter what you can't get one). No breaking the ice of incorporation is needed - this is simply a suit against the BATFE, an arm of the fed.gov. DC's government is also an arm of the fed.gov, as it exists solely because of, and at the continued pleasure of, the federal government. To me, that case is a gimme.
Oh, I hear the "but machine guns are different" argument. Yeah, they can be more lethal. So? A centerfire bolt-action rifle in .308 is far more lethal at far longer ranges than any 18th century musket or even Kentucky rifle - and no one is talking about bannng those. An argument for them is the need for the militia (us) to be familiar with the operation of the nation's standard military arm. OK, but not necessary. Here's a better argument: federal law ALREADY allows full autos and, in fact, there are over 100,000 presently in civilian hands. How can, for example, an M16 manufactured on 5/20/1986 be so "abnormally dangerous" that it can be banned, when a functionally identical one manufactured in the same factory on 5/18/1986 be legal? How can the older gun be freely transferrable to anyone who complies with the '34 NFA, but the new gun can't be? The whole argument of the fed.gov would cave in on that one point.
Another issue is whether full autos and short barreled shotguns can be subject to a higher level of regulation than other guns. If the RKBA protects a fundamental right to keep and bear ARMS (not firearms, but ARMS), then why is the exercise of that right subject to permission and a fee? Is church attendence or the right to buy a book subject to such regulation? No - because they are rights, not privileges. Right now, the '34 NFA makes the ownership of pre-'86 full autos a privilege...one that can be made vastly more expensive with the stroke of President Obama's pen (for example).
Incorporation is on the chopping block - but so is the '86 full auto ban, and possibly the '34 NFA.