Charlie Roy, Eindhoven won't be a base untill they have more relaxed opening hours. Ryanair have said this numerous times and I think it's that easy, yes they like Eindhoven(look at the number of routes and growth) but Ryanair can't profitably operate a base with the current opening hours.
However, in Holland there's work going om to change some regulation to make Schiphol less crowded(or grow slower) and I think when that goes into effect, Eindhoven will have better opening hours and Ryanai will start a base. Maybe march 2011?