When I started shooting back in 2010, I started in SS. I think the division was still provisional at the time, but don't quote me on that. That was before Practiscore, so I could only directly compare myself to other SS shooters on the USPSA website. Back then there was a real concern about fragmenting the sport through too many divisions. In fact, part of the reason I started shooting IDPA was because the local club always provided overall scores (the other reason was they posted their scores the next day, as compared to a month later or occasionally never). Now I'm the club president, so I guess that switch turned out alright.
I myself stopped shooting SS after going to my first sectional, where out of the 100 or so shooters, 8 people were competing in SS. I switched to Limited, but... I stayed in the sport. And that right there is about 10 times as important as what division I compete in. Now that people have excel like powers over the score sheet, have as many divisions as you like. There are enough trophy hunters to ensure that someone will still be competing in everything at the big matches.
Really though, if SS goes anywhere, it will be back into Lim10.