You say ITG couldn't last?
Ridiculous, and I'd like to see try you back it up with empirical evidence.
I know a good deal of people from the Rocky Mount region (In North Carolina, if you've never heard of the tournaments, which you should have) who STARTED dance games with ITG. Within MONTHS, they could play and pass consecutively 11s and the majority of 12s. This isn't to say that everyone can become good this fast, but to say that people are deterred from playing ITG because of its difficulty is absurd.
The only reason you say ITG is too hard to appeal to the casual player is because you can't play the expert charts, but you can read them. The simple fact that you can contemplate and understand that Summer expert has intense 16th runs at the end is because you've been playing long enough to understand the arrows. Someone who has never played a dance game isn't going to be able to look at Bloodrush vs. Waka Laka and tell that one is significantly harder than the other. Similarly, I'm sure when you started playing DDR, and looked at Max 300 on Heavy, you may have thought "Man, how am I ever going to be able to do that?". Yet that didn't deter you from playing DDR did it? The challenge to one day be able to simply pass it, let alone AA or AAA it only made playing more fun.
And another thing, the music in ITG attracts a lot more casual players, standard gamers if you will, than DDR could ever hope to. Honestly, if you took a survey of 1000 gamers at random, what are the odds of J-Pop coming up as being a genre enjoyed by a majority, or even a significant number of people polled?
Honestly, I'm detecting a lot of ignorant posts in this thread. ITG has mostly hip hop music? What? Have you even played it before?
And piepiepie, I'd really like you to name a few ITG charts that don't make sense. And also, I'm going to hazard a guess that you've never played Pump Pro. My friend got the upgrade for his Zero Cabinet, and tells me its quite good. I haven't personally played it, so I don't have any opinion to give, but its pretty clear by your tone that you haven't played it either, which makes you look pretty stupid because you're bashing it without ever playing it.