I am not a developer, just a user of opera since ver.9. This may sound crazy, but I don't care what engine they run the browser from. The problem seems to me, is that we loyal users have become accustomed to all the useful features that Opera once had. Bring back the ability to have nested Bookmarks, (some of us like organization!). Bring back the link service so we can effortlessly share our settings between computers.
I hope that Opera hasn't abandoned their PC based devotees. I have searched the web on smart phones and tablets, and found it a much inferior experience. I have experimented with other browsers, (Avant, Lunascape, and the name brand ones), and have found nothing that compares favorably with Opera 12.16. Previously, I had updated with every new version of Opera...
There are some features that I, personally, cannot do without. If version 12.16 becomes too out of date to use, and the developers don't bring back the old functionality, I will reluctantly have to move on.