Well, there are other theories about time travel floating around.
For example, the idea that time itself would work against you if you, say, went back in time to kill your own grandfather (before he met your grandmother). You might, upon traveling back in time, find he's left the room, or be waylaid in some other way. Basically, your grandparents got hitched, so your parents and you exist, so you can't go back and interfere.
Anything else strikes me as rife with grandfather paradoxes. The interconnectivity of events could cause the slightest change to balloon into a substantial change in the timeline.
Although, you could probably travel forward in time without too much of a problem. You could just never go back.
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