^ I would love it.
I comfess, I got into SDN too late... when I had the chance to apply to their shows, I didn't, and only checked them out once their disbandment was announced. So I checked out the one thing I could back then... the Minogashita performance of "Yuuwaku no Garter". This is actually completely different to their normal stage, as features double the number of girls, and they intersperse all their singles in between the stages songs. I loved the songs and the whole sexy vibe to everything. Performances like "I'm Sure" completely blew me away and definitely set them apart from AKB48.
When the stage CD/DVDs came out, I bought them both, and it became my favourite out of all the 48group stages I've seen. It's all killer, no filler (with only one or two songs of slightly lower quality). I still love it, although have yet to watch the Minogashita 2 version or the two revival theatre performances. Their "Next Encore" concert is also my favourite of the 48group concerts I've seen. They literally perform every single song in their repertoire. The first disc is full of fantastic upbeat performances, and the 2nd disc brings the tears with the graduation/disbandment stuff. Amazing.
Now I think a new SDN would be a great idea. There are loads of really good old gen members who are getting pushed to the back and don't even get to be undergirls recently due to the new gen/sister group push. Someone like Kuramochi would be perfect for it. And girls like Myao, Amina etc I think would fit well also. It would be nice for some of the recently graduated girls could be in it too (Sayaka for sure) and girls like Nontii who are still hanging around AKB (performed at both this years and last year's Tokyo Dome concerts whilst being a graduate...)