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 - 7 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.
As long as the demand to own bitcoin also grow faster than ever, i believe the reasonable price that time will be over $500k definitely.
But when there is no growth in demand then everything is just useless you know even all bitcoin available has been mined.
The advice here is , to never let your bitcoin wallet has a zero balance fill it as low as 0.5 bitcoin for your future plan or at least your future bet. Dont get rush , 20 years from now is short actually.