Every time we tried to see any form of "discrete" or "digital" physics, we found, that, in fact, the universe is analog and continuous.
can you back that up?
string theory is not infinitely scaleable for example (distance measurements invert once they reach the planck length), it could be that a discrete version could solve some of it's problems. quantum theory obviously operates on discrete units of energy as well, why not discrete units of space and time?
real-number based physics has hit a brick wall, general relativity can't explain quantum effects, and quantum theory is a mix of continuoius and discrete methods, and is obviously incmoplete. that's no guarantee that the real answer lies in a fully discrete theory, but the discovery of the planck constant certainly suggests it's something worth investigating. I've not heard much about Wolfram's approach though, sounds interesting.