I agree with johnvree's comment pointing out that the prior fireworks show (FITS) was not shown every night. I believe they made Wishes nightly for its first year, which has now ended, and I'm not surpised to see it going back to just a couple of nights each week sometime after the holidays.
I've looked at the Feb schedule for our March trip planning, and it looks like we'll be going to MK on 2 separate nights in order to see Spectromagic and Wishes. This really works out OK as far as I'm concerned, but then we go for longer trips (at least 9 days). I think this could be more of an issue for shorter trips.