Howling:Medusa Cascade Incident

i have a question. I dont know if it is already answered in another thread. It has been established that some of the events in the Whoniverse now never happened because of the cracks, and it is up to the writers to decide which ones got erased. But since Amy doesnt remember the daleks and planets in the sky, i'm assuming the Medusa cascade event now never happened. My question is, what happens to the people involved in that event? Donna, Rose, Martha..... is Donna still half timelord? is Rose still with the metacrisis doctor or now there was no metacrasis doctor and Rose never came back to the Whoniverse? So i think the wider question is.. the events erased by the cracks, they still happened but people forgot about them or they didnt happen at all? The doctor still remembers them so they must have happened in some way.. So dalek caan, davros, and the dalek army still stole the earth and got destroyed by the doctor but everyone forgot about that incident? or that incident never happened at all and dalek caan never existed to go back to the time war and save davros?91.73.110.3 13:47, August 9, 2010 (UTC) &nbsp