[haltist]

One useful way to think of the halting problem is that the future is not computable. There is no shortcut to finding out what will happen other than actually running the computer. I think all computational theories sweep this issue under the rug. Even if the universe is a computer (quantum or otherwise) it makes no difference to how people should approach their decisions. There are no royal roads so regardless of how much a situation is analyzed by symbolic simulations at the end if the day you still have to act of your own volition to actually find out what will happen.