From what I read, the electric shifting is most interesting for the time trial bikes (and that will mean triathlon bicycles too) because there can be shifting buttons on BOTH the ends of the extension bars AND the brake levers. Since the wires are just carrying electrons they can be routed without worrying about too sharp of turns that would add friction to a cable. Time trial bikes and triathlon bikes may well be enough to support a niche of electric shifting.
Bloomington, IN
1973 Chiappini single with downtube friction shifters (Campagnolo Nuovo Record)
2004 Kestrel Talon with indexed Campagnolo Chorus 10 speed with triple
2006 Santana Niobium with indexed Shimano 10 speed with triple (FSA crank, XTR rear derailleur, FliteDeck)