First of all, how do you know how many voices you are using at any one time? Is there a counter, or something?

Secondly, why not worry about a problem when it actually happens (which apparently is never!), rather than some theoretical time in the future...?

Things have changed a LOT in CPU power since the 9000 days. My G70 had a VERY noticeable improvement in the response time to big stacks (you can layer up to six stereo voices on one sound with a G70 - not that you would ever want to ) and can play very fast repeated chords with no discernible flamming. Something that even two stereo voice layers on the G1000 had slight problems with.

The G70 is FAST...!

And 'bragging rights'? PLEASE.... It's unnecessary needs like this that take your mind off of things you could REALLY use. Like the darn sampler load times. Want to hear the most useless Yamaha 'bragging right'? 1GB of sample memory.

That takes WELL over an hour to load!

Brag about THAT, and stand back as we all laugh our heads off. Just like 256 voices of polyphony when you have never gone past 128 (sorry, 126 )
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An arranger is just a tool. What matters is what you build with it..!