Bachus enjoy what you have now, it may be a long while if ever to get what you desire in an all in one ...and I'm sure this new Yamaha release whatever it is will be very far away from your wishlist.
I really dont expect anything like that any time soon....
And currently i cant see any reason to replace the PA4x and Kronos "ever" because combined with the software, there is nothing the setup cant do... Yet there is so much i cant do with the setup yet...
In general i play for 2 hours a day, even longer in the weekends, and enjoy every minute of it... improving my playing skills, and as said, trying to make those guitars sound like guitars and the Sax like a real sax...
Editing styles to be what i want them to be, and editing sounds to be even perfecter... and yes, finally my skills are getting on the level i want them to be..
However, some things will never change...i will always be looking for possible improvements. Thats just something you cant change.