Since I am a big fan of character creation in games (especially in fighting games), I can't lie and say I don't care for character creation. I like making my own characters and working out little stories.
With that said, even though I'm into CAS, I still care about the original cast and use them from time to time. But in SCV, I do find I use my own characters instead of the originals 4/5 times. The only main characters I use a lot in V are Viola, Zwei, Ivy, Natsu, and Pyrrha (even if her battle cries irritate me lol).
But one thing is for sure, It does sound like CAS is staying with SC for a good long time. It attracted more fans. For better or for worse, money is money and it's not like they threw away the original cast so they will always be there if you prefer to use them. :)
Now if they did get rid of CAS, I'd still play the games. My first SC game was SCII and I had fun without it. CAS just added a lot more replay value to me, that's all.