Joe Biden might NOT be on the ballot in OHIO???(didn't register in time)

Big question….what if the dems decide Joe is NOT going to be the one they choose….How do they "NOW" get the "NEW" candidate on the ballot in ALL the other states in time for the ELECTION???

If Joe bows out or they get rid of Joe….are the dems shit out of luck on getting anyone registered in all the states on the ballot in time for the NOV election???