The Dutch Ghost said:
Hello Bernard Bumner,
Sorry but the Super Mutants really are gone as a 'force', they have not way of restoring their numbers plus parts of the Midwest are subject to radioactive twisters and various other terrors.
By the time the Super Mutants would reach the East Coast their numbers would be severally depleted, well at least to such a number that they couldn't afford to just spread across town and just attack anyone they come across.
It really is Bethesda's plot twisting at work here.
Bethesda will clearly have to contrive an explanation as to how, and in what numbers, the mutants reached the east.
However, I'm just stating the facts as they're revealed in the first two games. As far as I know, the full extent of the
Master's army is never revealed. It must be significant enough that the epilogue in the first game sees fit to mention that the remaining mutants headed east (into no-man's land). In the second game, the issue is specifically avoided when you ask whoever it was whose relative saw the army (it bugs me that I can't remember), how big it was.
The
Fallout Bible states that super-mutants went into mass production in 2137 (although only a fifth of attempts at dipping are successful, and of those, only half survive to join
The Unity). The vats are finally destroyed in 2162. (In 2236, the
Enclave retrieves the FEV from the ruins of the
Military Base, and new mutants begin to appear, although these only ever seem to be confined to the base, at least until the
Chosen One turns up.)
So, the first-generation super-mutants are being produced 25 years - that is potetially a lot of them. The fate of the FEV, along with the second-generation super-mutants is somewhat more plastic, given the uncertainty as to what actually happens in
Fallout 2.
So, unless someone knows better - and I'm perfectly willing to be proved wrong - there are no absolute numbers for the
Master's army, and no preclusion on the FEV still surviving after the events of
Fallout 2.