I think most "crazy" ideas seem that way given the current constraints in that point in time and it's the domain experts that see the changing landscape which w

I think most "crazy" ideas seem that way given the current constraints in that point in time and it's the domain experts that see the changing landscape which will make them viable. It's hard to remember, but there was a time that YouTube seemed "crazy" as it was assumed that bandwidth costs would swamp the viability of any video startup. See also: almost all the "dumb" early web startups that weren't dumb, but mistimed the market (Webvan, ePets)