I know when I am wearing my black gloves at night I do wonder if drivers can see my hands, especially when they must see past the bright red lights on the back of my bike.
Anyone ever tried to see a gloved hand signal from behind a brightly lit bike? The talk of rear Dinottes' and such make me wonder if hand signals at night time can really be seen clearly. I know with only two Superflashes on my bike I can't make out the handlebars when looking from a few metres behind it in the dark on a moonless night.
Those thumb switch things have always worked well for mopeds and motorbikes, so in fact, I think drivers are actually very used to looking for them. The bright orange blinking kind of makes them hard to miss really. IMHO They have always failed to take off for bikes because they are cheap tat that breaks within days if not hours and also they need batteries, add weight, look horrible etc and so cyclists are used to carrying on the way they always have done.
I am all for ideas that make us stand out amongst the traffic in winter rush hour (+1 for eye contact) and thought this may have potential if the idea was executed well.