It would be easier for Hasbro to start a new 'canon' universe (as they may well be doing with WFC) than try to correct all the mistakes made through all the different series and media of the past. And if they tried to correct conflicts of events IE who came first megatron or constructicons then which ever way they were to go they would upset fans as I'm sure there would be hard cores on each side of that fence. I like to think of G1 as more of a war story and that each episode isn't so much as us watching it happen but a retelling of events and in that way it's perceptual and not stone cold facts. Which can solve most problems by simply by realising that the story teller has altered the facts or that they believed this was the way it happened.

Also, I just finished watching BeastMachines. What a S%^ ending. Just the worst eeevvvveeeerrrrrr!