In theory yes but it takes while before difficulty adjusts and since the price also doped it likely doesn't matter much. Its more of a problem security wise. T

In theory yes but it takes while before difficulty adjusts and since the price also doped it likely doesn't matter much. Its more of a problem security wise. There is now guaranteed hardware out there that can produce more than 50% of the hash power but its currently not "working" for bitcoin. This in theory could mean someone is secretly mining a longer chain which could later be made public and "reverse" the other chain. This is very very unlikely to be the case because the "missing hashpower" is likely being moved to other locations and that is the reason why it is not running.