If I'm not mistaken by 2038, we could have reach 99% of all bitcoin mine. So that alone will speak how the price will move after that. Because the rest of the 1% will be mine up to 2140.

So definitely, 6 digits around that time is not far fetch as bitcoin will be really scarce and everyone will be fighting to get at least a satoshi. Moon by 2038 and beyond or even much earlier.