A Ginsburg death and the subsequent decision whether to replace or wait until the election would be about the only political thing that could overshadow impeachment before the 2020 election. The Left will refer to Garland, and Republicans would note that Trump isn’t necessarily in his last term. It’ll be a big battle if it happens.
It will be a big battle regardless of when.
RBG and SCOTUS are the whole reason for this pony show...IMHO.