I think that would be enough, yes. I went to 25 and while there were several things I wasn't all that into, the stuff I liked more than made up for it. The 25 years house, Shadybrook, F v J, Werewolf and Alice 3D were a ton of fun for me.
I tend to like the originals best, so if I knew there were going to be four or more original houses I'd be psyched and wouldn't really want to know all the details about them before I went, just general themes.
The things leaked for 28 and the possibility of an 80's theme have me super psyched for this year. I am hoping it makes up for the imbalance of originals.
Also, if I'm being totally honest, I would go every year if I could afford it and could convince my girlfriend to go every year instead of going to the occasional new place on vacation. But, new things are good, so it's a wacky balance. heh heh
I hope that helped at all.