I thought the indicator applets were a bad idea, if tolerable--but after 15 years of using the Win95 desktop paradigm on my work machine, I don't know if I have the patience or desire to re-learn Canonical's new hotness that really exists mostly because Shuttleworth wants to pretend he's a one-man Steve Jobs and Jonathan Ive.
Not to mention poor grandma, who had Ubuntu installed by her grandkid; eventually she'll get a dialog asking if she wants to upgrade her "distribution," whatever that is, but hey, upgrading is always good, right? She'll press OK without thinking twice, and all of a sudden the upgrade will have given her computer a virus that moved all her icons around and she doesn't know how to use it anymore, can Johnny stop by run a virus scan and fix everything?
I guess if software vendors made cars, they'd randomly switch round the pedals to create "an unforgettable user experience" or whatever the bullshit du jour is.
My concern for the long-term viability of the entire Ubuntu project is what happens once a user's system starts notifying them that they should upgrade their distribution. Not sure if that happens for non-LTS releases or not, but eventually it'll happen. The user will click 'yes' and then be presented with an extremely different windowing paradigm without having asked for it. It's like having clicked 'upgrade' to go to Lucid and finding all my window buttons on the other side for absolutely no reason. Tech folks like you and I can adapt, but will Grandma continue using Ubuntu if every 6 months something crazy changes and she has to re-learn everything? She won't--she'll get fed up and ask for her "old computer" back, which means formatting and installing Windows from the rescue CD.
I guess what I'm saying is that you can't be both a viable alternative to Windows and Mac and also be a paradigm-changing evolutionary UI experiment. The two markets--nerds and grandmas--just don't mix, at least until the next generation or two.
That's before you get to the utter Fitz-law failure that is buttons animating out from under your mouse pointer...