I have no problems with updates and new effects/technologies being added.
But calling it "tired" misses on two major levels:
1- There has been no indication whatsoever that Illuminations has any popularity problems. Not even any whispers coming out that guests find it "tired". If indeed they are going to now make major changes, I'm sure talk of guest surveys and such will come out, but it doesn't take a genius to figure out that if such talk was legit, it wouldn't have coincidentally been "leaked" at nearly the same time the changes were leaked.
2- If we want to get down to it, Wishes is nothing but a rehash of every other fireworks show ever done at the MK. New effects, different arrangement, but in the end, its the same thing presented in a slightly different way. If we are going to throw out terms like "tired", let's start there. Heck, its current story is remarkably similar to Fantasmic.
Those shows have their place, don't get me wrong, but with all the homogonization going on at the parks, lets not start ripping the things that still provide some uniqueness.
Like I said, update it, add effects, whatever, fine. But what worries me is that we will soon hear that guests never did like Illuminations and nobody understood it, and that's why it was necessary to add the Pixar characters to the storyline...
But fortunately it sounds like the changes won't be that significant, if there's even any truth to it to begin with.