I wouldn'tstay you have a long time to wait. Based on reading the forums, I would say mine took longer than the usual. I can't complain, I really only use the card once every 3-4 months, and they have continued to give CLI's during that time. From what I have read, it seems lke people are getting upgraded at around 2-3 yrs.
I got the upgrade at about 2 years. Yes the store account goes to closed, and the discover reports as a totally new TL. My fico took a hit, but it's worth it. I get cli randomly all the time, where before had to ask every 4 months and maybe only get few hundred.