I don't feel that way in the slightest.
From the few things that are known about the RAZR HD, it actually doesn't offer that much of an improvement over the MAXX beyond the 720p screen and 13MP camera. Having used the Galaxy Nexus and the Rezound, while a 720p screen is nice, it's not earth shatteringly better than the screen on the MAXX. It's kind of like a person saying "My 42" tv is better than your 42" tv because mine is 1080p and yours is 720p." Well, that's true if you're sitting a foot or two from the screen all of the time, but if you're sitting six to eight feet away like any reasonable person, the difference between the two resolutions is unperceivable to the human eye. A higher resolution will allow more things to fit on the screen, particularly text, but it will also be smaller. With a phone, the point where small is too small comes quickly. The 13MP camera will only be an improvement if Motorola completely starts from scratch with a new sensor, new lenses, and new software. An increase in megapixels means absolutely nothing beyond larger files. So, at this point, nothing about the RAZR HD makes me regret having the MAXX, and I doubt anything will.
As for the SIII, while I certainly wouldn't mind taking one for a spin, the improvements it does have over the MAXX aren't enough to make me want to jump ship too quickly compared to what I'd lose. The screen difference goes back to what I said about the RAZR HD screen - a step up, but not a major one. The larger overall screen size would be nice though. The 2GB of RAM really won't mean much of anything with the way that Android manages running apps anyway, so that's more of a spec sheet thing than a real world thing. I don't care for Touch Whiz. It's too cartoony for me. And there are a couple major things you'd be giving up with the SIII. The battery is of course the most noticeable one. I don't know that I want another smartphone without a battery the size of the one in the MAXX. But at least the SIII battery is removable, unlike in the HTC One series. The second thing you'd be giving up is the stellar reception of the MAXX. Motorola knows how to make the best radios in the business. Samsung, up until this point, has merely been mediocre with their CDMA and LTE radios. The Galaxy Nexus was a reception debacle for me, and I don't know if I'd want to risk that again. Hopefully Samsung has made some serious radio improvements, but even if they have, I doubt they'll be as good as Motorola's. The only thing the SIII makes me truly envious of is the camera. But at this point, that one thing isn't enough for me to abandon the MAXX for it.
So, nope, I don't feel the way you do at all. There's nothing out now, nor is nothing currently rumored for a release in the near future, that really makes me want to get rid of the MAXX. And that's really saying for me. Dating back to the Windows Mobile days, I generally only keep a smartphone for a couple months before moving onto a newer one. But the MAXX is the first phone that hasn't had me antsy for something new. With the exception of the camera, I'm completely satisfied with the MAXX, and I see that continuing for a good while.