Will the iPhone 16 Pro fully support Wifi 7?

No one here could possibly answer that question. This is a user to user only forum. Apple isn't here and as users only we are not privy to anything Apple is working on for future products. Apple won't answer this question either until next fall, when they reveal iPhone 16. And when they do, you'll get the answer to your question then.

Whether iPhone 16 gets Wifi 7, you do realize you'd need a router or mesh network which actually broadcasts Wifi 7, right?