SRAM brings 1x to the road with new Force 1 and Rival 1 groupsets - BikeRadar
I'm somewhat interested. I live in a flat area and am rarely out of the big ring. I've done many relatively fast group rides on a 48x17 single speed without issue. A 48T chainring with a 10-34 11 speed cassette is more than enough range for me. The biggest potential downside for me is the relatively large gaps between gears compared to a 2x. The primary upsides are zero chain slap due to the MTB-style RD clutch, almost zero chance of ever dropping a chain and never having to shift an FD again.
I probably won't buy this but it's not a bad idea for some people.