It sounds like I'm in the minority but I will be sad when Cirque leaves. We see the show on every visit and from time to time we watch the DVD at home. When we were there last year we had front row seats which made for an amazing evening. But as a businessman myself I can see why they would leave. The theater last year was about 2/3 full and the show is essentially unchanged over the course of its life, so playing to full (and profitable) crowds has probably run its course.
We'll still be sad though....we LOVE the live music and the atmosphere that La Nouba creates. Again, different from most posters in this thread, but La Nouba is the main reason we go to DS, as we're not drinkers or shoppers......we're just looking for entertainment and a break from our real life when we go to Orlando and Disney. So I guess we'll spend more evenings in the parks (oh dang.... lol).