Kronos, QNX has a userbase smaller than that, and there is a port of Opera for it.
I think Opera on the Amiga has a chance. It's not much of a chance, but it's better than none.
QSSL itself paid for the QNX port, and it was done to make Opera available for QNX embedded applications. The QNX desktop is essentially a development platform for embedded systems; it might well be smaller than the Amiga userbase, but Opera wasn't ported for desktop users (developers), but for small-device users whose mobile devices, etc. run QNX embedded. I'm sure if Hyperion or Amiga, Inc. would like to Pay Opera Software for an Amiga port, then one would be done.
-- gary_c