I've been thinking about this. If you are planning to play with an orchestra, and can afford a guitar that only sounds good in a few keys, it seems reasonable to get one that is tuned and tempered to fit in with the orchestra. Segovia would probably have loved this, and I'd like the idea of using it on a classical guitar.
And even thought we're not talking about a classical guitar here, Billy Joel's, Elton John's, Alicia Keys' pianos are tempered. Perhaps we've finally reached the point where technology will allow this to be done for a guitar.
Then again, a piano isn't locked into a specific temperment, and "equal temperment" may not be the best sound for say J.S. Bach's Well Tempered Clavier" pieces. It's sure not what Bach was composing on/in.
Todd
edit: Just notice they offer different temperments, including one for that ^ exact collection, so I sent an email asking if they'd consider selling just a fretted fingerboard for a classical guitar.
Just look at yngwie malmsteens DVD with a japanese orchestra. It sounds amazing and he's using a plain jane strat.