The first time I read about it was in 1987-88. Almost 20 years later it hasn't taken off yet. So, no it's not the future of learning.
Do any of your guitars have fret markers?Cant play an instrument with your eyes. Better to learn to play by feel so you can have your eyes on the music if you are reading it -actually reducing how long it takes to learn tunes, the chord chart if you a following it, the audience if you are trying to connect with them, or the nice rack in the front row. You'd miss all that if you trained yourself with fretlight.