If the coin is not going to gather investors then what is the point of developing it? Probably you would be the one to fund the development itself if you really wanted to. Many people these days are now kore concerned about what is ‘in’? Or what is the current trend rather than what could be beneficial for the crypto community at large considering the future as well.
Investors aren't interested in old coins these days (with the exception of Bitcoin). They want something new and fresh that would allow them to make massive returns in the quickest time possible. You can see why "meme" coins and NFTs are extremely-popular these days. Old coins with unique PoW algorithms like Primecoin and Magi will remain a niche to the general public. Only a few of them (mostly crypto/tech enthusiasts) will actively-support these projects. With some coins being abandoned in development, don't expect to make a buck investing in them anytime soon.
I would've loved to see a Primecoin alternative that would help advance the discovery of Cunningham chains. Something like a PoW token living in either the Solana or ETH blockchain. That would be cool. Hopefully, a developer (or group of developers) will become interested in Primecoin someday. At least, the XPM blockchain still lives. Too bad it's only listed on one exchange.