The way James handled time travel in Eugenesis was thus; everything is predetermined and nothing can be changed. There are no alternate timelines or erased futures. If someone enters your time stream from the future, then he was always meant to enter it and everything from then progresses as it should.
For example, if someone travels back in time to alter the course of history in his own favour, then he is already destined to fail because he already did it and there is no historical record of it.
The best example of this in Eugenesis was the introduction of the Quintecons. Decepticon body-types discovered in the ruins of an old Decepticon fortress who, upon being awakened, suffer amnesia yet follow a mysterious homing instinct which leads them to the Quintessons. The Quintessons ask no questions, and take the trio down. They later upload the minds of Quintesson generals into the three Decepticons, and after a series of events, find themselves trapped in Earth's past where they are locked up in the basement of the Decepticon stronghold, where they will later be discovered and awaken with amnesia...
But it depends on how the concept is used, The entire Marvel UK Galvatron saga was and still is some of the finest TransFormers fiction created. And my personal favourite TV series, Beast Wars, was hinged entirely upon it. So I can't say it has no place.
But it *is* a bit tired now, and as Hde says, someone would have to do something pretty spectacular with it for me to get enthusiastic.
Print me easy!