I think Shane is seeing the smaller scale replicate the large scale.
Working as a stage hand I'm seeing a lot of LED fixtures of various types, more LED-based video on pixel tubes, curtains and smaller panel mosaics. What I'm not seeing is a whole lot of conventionals beyond Lekos and audience abuse.
As a provider, we're in kind of the same boat you are, Bill. We own a bunch of loaded PRT and extra 6-bars. For now we'll continue to use them, but we're thinking about stripping them to single-hung with 3 watt RGBAW replacing the PAR cans. A big issue for us is weather ratings for the LED fixtures. It's easy to leave conventionals in some rain; they're mechanically and electrically simple devices, but the LED cans will need to be rated for, and maintained to a particular weather standard. The concept of a relatively cheap retrofit ain't gonna happen. If we worked indoors only, it would be less of an issue.
As for LD acceptance, you'd have to negotiate that on a per-show basis, but if your LED cans will cover the areas needed, match the plot colors and deliver the needed intensity, I don't think you'll have too many issues. A good lighting tech from your shop should be able to get most LDs what they want.
FWIW, PAR can rigs are about as salable as PM3000s right now. I expect folks with cans in ratty shape to recover more value at the scrap yard than by selling as LX.