Interestingly, e-bikes are far more popular in Europe than in North America, yet E-bikes are restricted to 250 watts and 25kph (15.5mph) in the EU. In other words, there is an enormous market for bikes that are EASIER to ride, but are not necessarily any faster than a standard bicycle. I do not fit into this category.
I tend to believe that once people ride a class 3 (28 mph), they'll want one, and a significant percentage will want more speed than that. I assume in the EU, commuters will simply opt for scooters and motorcycle (or cars or trains for that matter) if they absolutely require more speed. I like the idea of a fast 35+mph bicycle, but it looks like I'm in the minority on this forum at least.