Daniel Bryan winning the WWE Title is certainly a logical story progression, having been screwed out of it so many times, and it's certainly something the fans want, but it's not the only way forward.
I wouldn't argue that Daniel Bryan vs HHH has been consistently built up since Summerslam, but there is more than enough material there for an overwhelmingly compelling match/storyline between Daniel Bryan and Triple H. Triple H was directly responsible for the first screwjob in Montreal (edit: I clearly had other screwjobs on my mind...) at Summerslam, he was involved in the HIAC screwjob, and it is very likely that he has been indirectly involved in every other screwjob. That's not to mention the B+ player stuff, the weeks following Summerslam, the "I only fight stars" line, and Triple H taunting the fans on the post-Rumble RAW. I understand that Triple H's character has been flip-floppy since this whole story started, but his general disdain and dismissive nature towards Daniel Bryan has been constant throughout. It's clear that beating guys like John Cena and Randy Orton isn't enough to prove himself. Winning the WWE Championship isn't enough. What's left for Daniel Bryan to do to, as Falcone said earlier, "get the monkey off his back"? He must prove himself directly against Triple H. Winning the WWE Championship will follow from this.
That all being said, this is easily my most anticipated Wrestlemania match. The story has generally been very compelling for me. Triple H has been god-like when he has gone full heel in The Authority; he knows how to rile up the pro-Bryan fans like none other. This means that not only will we get a great in-ring match, but the crowd reaction will make it extra special. And I say that six weeks before Wrestlemania. The hype train will be even bigger once the proper build to their match begins. I'm excited. Very excited.