Generally speaking, the IC & Divas Championships are really the only titles that've changed hands frequently for quite a while. WWE has played hot potato with the IC title between Ziggler & Miz since Wade Barrett was injured and Miz won the vacant title. I don't see a purpose in Miz winning the title again last night as it just continues a feud that's gone as far as it could. As far as the Divas Championship goes, I agree with the poster above in that it's something of a test for Paige. She's only 22 years old and there's still a lot of untapped potential in her. Even though she's been in the business for quite a while, since her mid teens, she's wrestled primarily for her parents' company and WWE is her first real step outside of the nest, so to speak.
The WWE World Heavyweight Championship hasn't really been the subject of hot potato when you think about it. Orton won the WWE Championship for the 8th time in late October last year and held it for about 5.5 months. Bryan won it from him at WrestleMania XXX, but had to vacate it due to injury, John Cena won the vacant title at Money in the Bank because he was the only one on the roster at the time who could've dropped it to Brock Lesnar without looking weak. Had Bryan not been injured, he would've at least held onto the title until SummerSlam.
The United States Championship has only changed hands once in the past 16 months, so hot potato most definitely can't be applied to it.
As far as the WWE Tag Team Championship goes, technically, WWE hasn't been playing hot potato with the tag titles for over 3 years now. While the title's relevance has only gone up within the past couple, with the exception of the New Age Outlaws 6th title run, every title reign since late August 2011 has lasted 100 days or more. Team Hell No held the titles for just over 8 months, Rollins & Reigns held the straps for just slightly less than 5 months and The Usos run of just over 6.5 months came to an end last night.
I agree that just switching the titles around devalues them, but it's a practice that WWE has moved away from quite a bit over the past few years. It can serve a purpose every once in a great while, such as what we saw with the Daniel Bryan storyline. While it may not have been intentional for Vince to push him, it still happened and it worked out in a way that made Bryan sympathetic while fans rallied around him because they were interested in seeing what happened.
At the same time, however, let's be honest because some complain about the titles no matter what. If they're not held long enough, the reigns are meaningless. If they're held for too long, some fans want someone new. If they're not defended X amount of times in a certain time frame, they're meaningless. If they're not defended on television often enough, people complain. If they're defended on television more than X amount of times, people complain. While I do personally dislike seeing hot potato played with titles, it's a pet peeve of mine, and while I do agree that it hurts their image, it's not as if WWE can ever actually win. I also agree that Vince could certainly do more to promote the titles' value as a whole more than what we see. Even so, I'm sure some would still find something to complain about. I mean, some people gripe because WWE hypes & pushes the WWE Network for God's sake, which is exactly what any company with any product is supposed to do. I wouldn't be at all surprised if such a push of the titles resulted in threads along the lines of "Why is WWE pushing the Divas Championship down our throats?" You can't be all things to all people and because of that, depending on who you are and what your personal preferences are at any given time, as I said, WWE can't win.
Every once in a great while, enough fans will seemingly get what they want, when they want it and exactly how they want it so they'll be content for a little while. That doesn't often happen, however, because it's rare that so many fans all seem to want the same thing. Daniel Bryan's main event push and title win is one those few "perfect" moments in several years. As for the rest of the time, to one degree or another regarding one complaint or another revolving around any of the titles at any given time, it's business as usual.