Exactally, and besides the point that the peolpe on Marbalue are like dead or those ghostly things anyway >.>
Basically, in 1020 everything get's merged again. It split in 1010, and get's merged in 1020. Anything that happened before 1010 is the true past history. Anything that happened between 1010-1020 I'm not sure about. Since once the dimensions reunited, and alot of things were missing like FATE was dead, Lynx, The Dragon God's etc., they would not exist in the reunited time line. But the history that FATE existed should be there, just that in the future, it's un determined if they ever attempt another Chronopolis, since it won't work anyway because they don't have the flame.
Also, I think the Chrono Cross would exist in the reunited time line, since there's no more Tear of Love or Hate, they did merge into one, and since one dimension doesn't have the CC and one does, that should mean that the CC get's put into the reunited world.