Many people, that are somewhat into the hobby and play 5e, will at some point hear about Starfinder or maybe even Starwars D6 or generally are just interested in sci-fi / space because they are nerds.
Its just a matter of time before they wonder if something like that extists in D&D 5e and they find out about Spelljammer.
Its just a matter of time before they wonder if something like that extists in D&D 5e and they find out about Spelljammer.