Gorsuch would have to be confirmed and sitting on the court when the case is argued before it in order to have a say in deciding the case.
As for changes once on the Supreme Court...look up Earl Warren.
Trump has no way to remove a sitting judge. It can only be done by Congress through impeachment (in the House) and conviction (in the Senate). It's only been done 8 times in US history.
Biting the hand that feeds IT
