Not sure how it's an FU to customers because it's not like your phone isn't going to work anymore. They do this to almost all their phones a year or so after being out.
I got the Sidekick 4G when it first came out then later changed to a G2X. The G2X was great especially for games, but having been so used to having a keyboard it was hard to adjust to.
So I just went and got another sidekick and it's still as good now as it was a year ago. I've tried a lot of phones and the SK4 still has one of the best keyboards out there.
I wouldn't be surprised to see a new model coming in the next year.