There is no power within the Constitution for the President to replace the Chief Justice.
You must be thinking of some other country, like say, Venezuela.
My guess also is that you have never read a word of the ruling which has made you angry. Or that the ruling has actually made repeal EASIER.
You are right that it can’t be done. But I am curious why you defend the Obamacare ruling. That argument that Roberts is a sly dog playing chess while all the rest of us, Scalia, Thomas and the entire conservative movement, are too stupid to realize it, is deluded or intentionally meant to make excuses for a pitiful weak Supreme Court justice who had only pretended to be a conservative. The law was dead. Dead. D E A D dead. Roberts singlehandedly resurrected it, with a ridiculous tax argument that even the libs didn’t make. If you defend that, you may be in the wrong place.