Anything with an MP3 player and vocal canceler already IS, Donny

The trick is, just like One Finger Chords, you don't HAVE to use it...

And Ian, sorry! But I catch so much flack for ASSuming things, I guess I just try to reply to EXACTLY what is written

What I want to know is, Ian, why is the market any different now from ten years ago? Basically, the same people are using arrangers now, that used them back in the G1000's day, and NO-ONE is accusing that of being a failure...
The only thing I see much different is the appalling jump in prices, as dubiously useful features get tacked onto what used to be a thriving market. NONE of us needed a vocal harmonizer ten years ago, none of us needed MP3 players, samplers, motorized screens (what's up with that? - just one more thing to go wrong!), dual mike inputs...
But all of these things have added considerably to the cost of modern TOTL arrangers, and their complexity, and in all fairness, aren't generally the things the 'home' user uses, anyway. Most of them buy an arranger to PLAY, not have it play FOR them!
Maybe we are just pricing the TOTLs out of many's reach?