Well they certainly don't end until 2006.
While the parallel evolution tidbit certainly helps us point out that many of these sources don't have to contradict, it doesn't stop thing like Planet 14, Marinus, and Mondas all being the same planet being contradictory. Trying to make a timeline of all the Cyber-origins is hard, because to do this we would also have to figure out where stories like The Keys to Marinus are set in this mess.