I concur in that I was also not as entertained this season, but I think the problem was that the stage dancing was almost exclusively contemporary (or "jazz", which seems to just be a more emphatic version of contemporary). And even the hip hop kept falling into the contemporary ditch.
Also, there are various genres of street dance - they really missed the boat on showcasing all the different styles (krump, old school, all the regional styles they talk about during the audition). A lot of the hip hop mushed together too.
I just looked at the ratings for the final show, and the audience was 1/6 that of DWTS's first show, and was ranked 4th of the 5 networks listed. I believe American Ninja Warrior was beating the show all summer.
So, yeah, I'll be surprised if we see another year.