How I've always viewed the Artificer is as a sort of magical swiss army knife. I liked the idea of an Artificer with a batch of mundane items and equipment that they can then use their infusions to enchant those items to make them the right tool for whatever obstacle they've encountered. I think that's certainly feasible within 5e's framework, but it would take, as with the original class, its own kind of set of infusions. Should certainly be its own class. Archetypes could include the above-mentioned swiss-army-knife/explorer, as well as a Zil Binder for your elementalist/khyber dragonshard specialist (since SCAG already introduced us to racially restricted class archetypes). Probably would want to come up with a third option to give non-gnomes an actual choice, but I'm drawing a blank at the moment.