Probably they will switch as vehicles get into higher performance requirements. Alcohol's a great fuel to work with: clean burning, room temp, good cooling prop

Probably they will switch as vehicles get into higher performance requirements. Alcohol's a great fuel to work with: clean burning, room temp, good cooling properties, but it'll be tempting to switch to something else when you need more performance--and have the money and experience to deal with the extra complexity. (And RP-1 isn't that much worse, unless you have a particular problem with coking and a reusable engine, while it gives a noticeable increase in ISP. If you can handle the low density, methane's nice and clean.) But part of the new wave of space development is to optimize for cost and simplicity instead of performance, and you certainly can do real stuff with alcohol; many early rockets used it. It's possible someone will keep using alcohol; Masten's suborbital stuff might certainly stay that way. Doubt they'll land on the Moon with alcohol, though.