Do you know how many people still go back to developing on old systems and old languages that are no longer supported for the hell of it?
It's like saying we were stupid to preserve any information about any outdated software simply because "it's not widely used". Data preservation, weather the community is shit or not, can always find a way to be useful.
I have information from a preserved database about the hexidecimal codes for each individual assembly call on the original gameboy. It's out dated by over 3 decades now, doesn't mean I won't use it. It's like the wayback machine. Just because it's not important to you, doesn't mean it won't be important to another user later.
edit:
Preserving that database isn't just preserving eclipse origin's shitty "HELP ME DO A SPRITE" thing. It also has support threads and even code from the original mirage game engine that eclipse was derived from all over it.
It's important to preserve software, and the assistance and data the came with it. There are sitll database clones for the original GunZ the Duel floating around the private server fanatic's segment of the web. That game has been dead for YEARS.
Hell, if I had the time. I'd have a field day with Eclipse Evolution or Eclipse Stable, just for shits and giggles.