We just don't have the technology to do so. The amount of time and power required to brute force this is hard to say. It would take who knows how many years it could be after most of us are dead.
Maybe if a future far far away... but not going to happen anytime soon.
....saving space
Holy crap, the amount of misinformation in this thread is mind boggling.
First off, the theoretical limitation IIRC is because of thermodynamics NOT the speed of light. Everything you do (including calculations) requires energy. There is a minimum amount of energy required for any single calculation and hence you require incredible amounts of energy to actually bruteforce the entire keyspace.
... saving space
So I am right it would be after we are dead. If you look into bruteforcing there are breakthroughs at times such as when the industry went from CPU to GPU to crack many things, this was a huge advancement. And there is always Moores Law.
I did not do the math as it is something that is not plausible. Not trying to pass misinformation.