If you run away from a mistake, you haven't learned from it. Making a GOOD 76 would have been learning from it. Abandoning a market that Yamaha's vaunted 'market research' MUST have proved was there (otherwise, why make the 9000pro in the first place?) because your first effort failed (for no reason to do with the number of keys) isn't LEARNING.

It's QUITTING.

Maybe it's an old Japanese proverb? "If at first you don't succeed, QUIT!"