I would like to see Evernote's AI evolve to a point where it would process my ~4500 item knowledge base (KB) of personal notes, clipping and documents, and then allow me to ask questions that would be answered based on that volume of information.
Notion's AI is decent for this, but not very good at finding things
What you're asking for is more or less already a solved problem with a number of different AI tools. Whether it will work with minimal effort on an Evernote account, I'm not sure.