I'd much rather see four or five really active sites than twenty that nobody visits. Just my two cents worth, eh?
Not that I entirely disagree, but I think people are just concerned about losing mods in the case that PES does shut down, though we're being reassured now that this is not the plan. But it has been a wake-up call. It's such a go-to place that it's natural that people might think to give it a try on making a site. I don't think anyone's talking about creating yet another indie Morrowind forum.
I'm one of those modders that prefers to make her own website for her mods rather than uploading to PES, but I hope my the website increases the experience of the mod by supporting it properly. Will I end up hosting some other mods? Probably, but not a lot... if I create a recommended mod list, or if there is a mod that needs a home/ needs rescuing. Will I have forums? Only if people ask for it, which I don't anticipate. So, add one more site to the kool aid vat. We'll let the users be the judge as to whether it dilutes or flavors Morrowind as a whole.
I have no way to measure it or prove it, but I feel like we're going to have an upswing in the amount of active modders for Morrowind, especially as people realize how far the modders have improved it. Morrowind offers a huge variety of settings to use in a mod, and with the fact that it doesn't have physics automatically added to all objects, it has a lot of potential for a lot of very creative mods (hello upside-down dream sequence?). That and the fact that Morrowind isn't littered with mods with horrible voice acting, With MSGO, people are going to notice - not in droves, but in a gently increasing amount. Maybe my viewpoint is skewed because I've only been modding for 4 months, so I think others will finally start as well, but I've seen new faces pop up in here since I showed up. Just have to have a good attitude about it - each time someone pops in and asks for help choosing mods for their new install, you might have them come back six months later as a modder.