I understand why some folks would be cheesed off about this. If I were on one of the $7.99 plans I'd be pretty upset too.
I'm currently on the 2 disc unlimited, unlimited streaming plan. For the longest time it's been about $15 (it went up $1 last year). For me, adding another $5 is not a huge deal, mostly because I go through at least 24 discs or so a month easily and use the streaming too. However, I realize that may not be the case for most folks and my usage may be unusual.