I remember reading that DeYoung released an album a few years ago that supposedly rocked and was very 70s Styx-ish, but I've never gotten around to checking any of it out.
And that is sad but true about fans going to see old bands. There are even a fair number of Rush fans who don't want too much new music at live shows, but to their credit, Rush's attitude is, "Too freaking bad; we are playing them anyway," and they still draw well, so it doesn't hurt them at all. But they always do a great mix of new stuff, the classics the casual fans want to hear and deep cuts the hardcore fans go nuts for.