My guess is that turnout will decline over the next several cycles, for "regression to the mean" reasons if nothing else (2020 had the highest turnout since 1900), so it might take a while. Contrary to pbrower, I wouldn't be surprised if 2024 is a comfortable victory for one side or the other but the winner still receives fewer raw votes than Biden '20.
2020 was an exceptional election year with covid and with Trump and all that. Like you said, highest turnout since 1900. I feel like its gonna go down until the US population is big enough to give a candidate higher than Biden 2020.