The more I read about these issues, the more I'd like to see 46/30 doubles become common. We're suck with 50/34 (on 110mm bolt-circle diameter) for current compact double cranksets, so 34t is the smallest chainring they can handle. But even 50t is larger than I need unless I'm on a fast group ride. For riding solo, if I spin out of a 48/12 gearing, I'm already in tucked descending position and not pedaling.

A long-term hope is that one or two bike companies resurrect their forges for 94mm BCD cranks aimed at the mountain bike market. Just using the two outer rings and a narrower bottom bracket.