nothing is perfect in this world, but if it happens, it will take a very long time, when they tried to hack her, the bitcoin users also fix all the weaknesses that exist within bitcoin, all of this has always kept a continuous
Actually, it is not possible to fix the weaknesses (such as the 1MB block size, 51% rule.etc) that are associated with Bitcoin. It needs a number of hard-forks, and since there is no unanimous support for this, it can never be implemented.