They're not under Avex anymore definitely, but I've heard a few different things regarding what label they're with now. CDJapan says their newest album is with
wint, but I've heard Gambit too. I don't know anything about Japanese labels, so yeah.
To answer the original question: Hell yes I would. But then, I am unreasonably attached to them. As for the people saying they don't have enough songs to make a strong release, my BeForU/BeForU members playlist in iTunes has 209 songs, with a couple of them being IIDX/GFdm songs that sound different from the album versions, and a few instrumentals, etc. Considering how many more songs are in DDR today compared to when DS: Dreams Come True etc came out, it should probably have... pretty much all of them.

All of the tracks from BeForU/II/III, 6NOTES, B-sides from singles, their upcoming album Shangri-La... Riyu's albums, begin and every struggle... maybe live versions from their concerts? DDR/IIDX/pop'n/GFdm songs that sound different from the album versions...
It would be super-awesome-amazing if they pulled music from related bands like kosumosu and
Pinkbeatz/the other members of
Cover Girls (formed by some former members of BeForU who should probably look familiar :P), but seeing as Pinkbeatz/Cover Girls don't really make any mention of BeForU on their site, I'm guessing they wouldn't want to be in a DDR project with BeForU. Since this is entirely hypothetical and is never going to happen anyway though, I can dream.