Q: explain the theory of everything
A: that can be any length, so the theory would look different at each length. there is no upper limit on the length of the theory. so indeed the only non-arbitrary choice for a fixed value for the length of the theory would be zero. this unfortunately seems like it's leaving out a lot of possibilities. the second most non-arbitrary choice for the length of the theory would be 'infinitely' long. which actually shares the same problem as a zero-sized theory, in that it lacks any specific discernable detail. so indeed, anything will eventually lead every possible other thing, in due time, in a natural order that may or may not surprise even itself. enjoy