Let me know when Siri can do even the most basic things using natural language. It can't even properly answer things like "hey siri, is apple juice already on my shopping list" or answer most questions that require a web search. Summarize it for crying out loud, I asked you because I'm not right next to my screen to click search results.
THAT would make me take an upgrade. Until then, I'm just keeping this phone until it goes out of support.