Moving to webkit just let them focus on what actually made them unique to their customers.
On the other side Chrome based Opera is also starting to look pretty good in it's own rights: it's fast and snappy, mouse gestures are there if I'm not mistaken, page stack (or whatever the name is) is cool. If I would to choose between Chrome and Opera 16 now I would go with the latter (also because Chrome really pushes too much Google on the user).
It's one of those features other browsers simply do not have (Opera has a couple more but this one's pretty unique) that I really do use several times a day, and I'm not "upgrading" until I know they won't take that away.
Not that it matters too much, features or not, I'm thinking to switch to Firefox because these are times no longer to be using closed-source software.
Looking at the course Blink based Opera has taken thus far, it doesn't look like they're focusing on keeping current users happy (any new user base is going to be an uphill climb). It's still new, but as a consistent Opera user for almost a decade, I'm very skeptical of them keeping all the previous customization as well as avoiding "Chromisms" in the UI.
And the IRC client and BitTorrent client?
How do you increase you're competitive abilities by removing everything that made you unique when you're already the underdog? :S
