Sure, Supreme Court volatility opens that up. The last time his Chairmanship was under threat it was unclear if he could be removed by Trump simply because Trump wanted to so it would require the usual "Do the thing", get sued, take it to the Supreme Court. Such actions aren't instant even for the President, especially if he is busy having them settle his other matters he wants to bring to them.
https://www.pbs.org/newshour/show/does-the-president-have-le...
Also, removing Powell doesn't let any president put someone in who will set whatever rate they want. It must be a member of the Board, of which two are his nominees from his term. They also don't have to listen to him.
When it comes to setting rates, Powell is chairman, not supreme leader. The FOMC sets rates and that is a group of twelve.
https://www.investopedia.com/terms/f/fomc.asp
Given Trump wouldn't see sworn in until 2025 and would have the usual problems of any new President rather than the benefit of a second term, and as Powell was confirmed in 2022, under current case law, Trump at best simply gets to nominate a new chair a number of months before he'd do so in 2026.
Powell's single 14 year term on Fed board ends in 2028 so there will be a new Chair no matter what after that.
While from a Political standpoint, I don't like what he may do, I am ok with how this is setup. This is not as easy as simply replacing his cabinet members and that is a good thing.
