Bad move. Bad, bad move.
The innovation and power of Opera is what earned it respect from users. With the switch to the new browser engine, they’re removing the e-mail client and news reader. Now Opera will be “just another browser”. Ouch.
Additionally, without the full integration, features such as mouse gestures are gone; part of the interface native to Opera that diehard fans relied upon. As a stand-alone e-mail client Opera’s version is very, very weak.
I don’t see this ending well, at all.