I was a fan of Opera and, as many of you, I'm very frustrated and angry with the lack of features of Opera 15. Perhaps Opera was trying to gain new users with a clone of Chrome, despite the loss of "long-time" users, or perhaps they really wanted a "tabula rasa" where they could rebuild the browser with, in time, almost all its features.
It doesn't matter. Opera 12 is dead (including my beloved M2) and all of us have made our point. Now, we can only wait for future versions of this new Opera and see if they are listening to users.
My opinion: In due time, we will have a browser with almost as many features as Opera 12, but more compatible with webs.
Every day I repeat to myself: "All will be well"