That would be 200m$ worth of BFL hardware... Not going to happen, leaving quite a margin for less efficient device to cover their investments ... at some point.
Are you one of these guys who think that "640kB ought to be enough for anyone"?
If Bitcoin continue to succeed, it
will come to a point where $200M will have been spent on mining hardware.
Just consider that today alone, $20M has been spent on CPU/GPU/FGPA mining hardware.
Going to $200M is only a 10x increase.