I tend to think that enthusiasm is on an upswing. RPG Objects is putting out great supplements and has just retooled Darwin's World for D20 Modern. Sidewinder is also being re-vamped for D20 Modern. Even the new Gamma World is D20 Modern. I just wish that Mongoose had used the D20 Modern engine for B5, Horror and Cybernet. Alas they insist on using the D&D model.