Yes, 7.x has gone from here. I've got a new machine and I started with the 8.0 beta. I only use Opera for testing, and because of the very low number of Opera users for my sites' demographics, I can only reasonably expect to support the latest Opera version unless a client specifically demands otherwise (they never do). I try not to do anything which is likely to break in older versions though!
One big disadvantage for me is that Opera still hasn't released a version for 64-bit Linux (I'm running Ubuntu on AMD64). Because Opera is closed source, no-one else can build one either, so I'm having to run it in a 32-bit chroot. I liked Opera back in the early days before Mozilla was stable, but it has been years since I've used their browser for anything other than testing.