Definitely one use case for IPFS I'm personally super excited about. One objection that I'm sure will come up is "what if people stop hosting a package you dep

Definitely one use case for IPFS I'm personally super excited about. One objection that I'm sure will come up is "what if people stop hosting a package you depend on": That's where dedicated package hosting services (like npm) can come in and provide a reliable source of these packages that's fast and always available (potentially for a price). The benefit over the status quo is those services will be commoditized, so they have to compete purely on price/reliability, since as a user you don't have to care where the packages come from in a content-addressed system.