I speak with JT, Birdman and others on an almost daily basis. Dirrk really has been AWOL as of late, but I'm sure he'll be back around. There are a number of people involved in development for the Fascinate, and the support will be strong. I'm happy to try and answer any specific questions, but keep in mind the following points.
1 - The device was released less than 2 months ago. Many of us got the device on the first few days, but for those of you just catching up, you're still in the early phase of this device.
2- MAJOR players have left the Droid X and jumped to the Fascinate. The most well known probably being Birdman.
3 - You will likely not see a 2.2 ROM until after Froyo is released for the Fascinate. We tried to build 2.2 aosp based off of the Galaxy S leak, it was a nightmare. We're having enough trouble as it is with 2.1 aosp.
4 - Don't compare the Fascinate (and its development progress) to other Galaxy S devices. There are some critical differences, including internal storage and CDMA vs GSM. While devs for the Vibrant (for example) could poke around and see how things were done with the Galaxy S / Captivate stuff, we have no one to look to. Some Sprint Epic stuff is portable, but most is not (4G, keyboard, etc..). Now that US Celluar has a device, we might see something from them, but I doubt it. Their user base is so small compared to ours, but you never know.
All in all, this device is going to be big. Once the issues are ironed out, you'll see an explosion of releases. The fact that people are leaving the DX to come here should make you feel a bit better.
Would I return my device for a DInc HD? Maybe.. We'll see when the device is actually released.. We're still in rumor status. Keep in mind that it will more than likely just reset the clock back a few more months on development. ROM's just aren't going to magically be available for it either. It might come with Froyo, might not.. who knows? If you're within your 30 day window, I'd say pay attention though, it might be a good option depending on the final product.