If Republicans take back congress and the presidency in the next election cycles, a national abortion ban becomes a serious possibility. This is not just a "red states" issue.
I'm not so sure. I predict they will torch the filibuster and enact laws that entrench their power for decades. The problem is already that they are barely accountable to voters.
Depends on how effectively they can link it to interstate commerce or one of the other powers given to the federal government in the constitution.
Also depends on how the current supreme court feels about the commerce clause. I am not sure if they have ruled on anything involving that recently.