I wouldn't mind trying sram component groups, why not? I'm curious about etap, and I'm sure it's great, but it's not without it's share of criticisms. The system supposedly shifts a bit more slowly than it's competition, which should not be an issue with electronic shifting.
As far as double tap, who knows, I may love it, I may not. I'm sure it works well enough. It is a bit telling that sram is rarely if ever specced on road bikes anymore. .
I don't think they'll go out of business any time soon, but it's not clear how their 'meat and potatoes' mechanical road groups offer anything that is clearly better or even different compared to shimano or campy.