Confining Themselves to Irrelevancy

Hi,
Question: Do you think the Democrats would be happy if Joe Manchin switched parties and became a Republican?
Let me rephrase that: Do you think smart Democrats would be happy if he joined the GOP?
I think the obvious answer is of course not. Republicans would take over the Senate. Mitch McConnell would become majority leader again. Biden would get fewer liberal judges confirmed, and even more Democratic legislation from the House would be DOA in the Senate.