First off, I still firmly believe that they messed up the ending of Punk's reign, he should have won at Royal Rumble 2013 (ie no re-start), and lost the belt at Wrestlemania 29, which rant his reign would have been extended to 507 days. But I digress...
Will Punk's 434 days be beaten? It's entirely possible, especially since WWE seem very open to the idea of 'sharing out' ppv main events these days, a side-effect of the WWE Network negating the need for ppv buys. There is less need for the WWE Champion to headline every show, so of course more lengthy reigns could theoretically happen.
Now, will Seth Rollins' current run be the one that beats Punk? I don't think so, and the reason is simple: Wrestlemania 32 in Cowboys Stadium.
Over the previous 31 incarnations of Wrestlemania, the face has left the building as WWE Champion (or WHC the few times that main evented) more often than not; a heel has, I believe, walked out of WM as champion on 4 occasions out of 31; on 5 occasions, the main event wasn't a world title match (1, 8, 11, 26 and 28); on each of these 5, the Babyface won. So in 27/31 Wrestlemania main events, the feel-good-factor was the order of the day; in truth, even in 3/4 heel wins, it was more about the shock factor to build on (Stone Cold's turn at 17; the Rock costing Cena at 27 and Rollins cashing in Money in the Bank this year); only Wrestlemania 16 can truly be seen as a heel 'properly' winning the Wrestlemania main event.
With that model in mind, and with Vince keen to fill 100,000 seats in Dallas, it would be highly unlikely that he would (a) have a heel win the Rumble to chase a face Rollins into Wrestlemania, he needs an epic showdown for the belt (assuming it goes on last, which IMO it always should except in exceptional circumstance like 26 and 28) and (b) if Rollins, as I hope, goes into WM as heel champion, Vince likely wouldn't have him walk out as champion and risk leaving 100k fans feeling flat at the end of the show.
I genuinely believe that Vince already knows his Wrestlemania main event, and that Rollins will lose his title there to elicit a mega-pop, which is why I've said for a while now that I have a feeling that Daniel Bryan will win the Royal Rumble match in January.