I'm afraid you guys will be disappointed.
Your crystal balls are a bit cloudy.
You can rest assured a new Yamaha TOTL arranger is under development. Why would they discontinue a product line that is selling remarkably well, and is enjoyed by amateurs and professionals alike?
They won't.
Donny, you woke up and got the S910 because it was cheaper, and it plays SMF as well as the Tyros series.
So, why not save money?
That was a smart move.
Ian