Re: X-MEN: FIRST CLASS - Grading+Discussion **SPOILERS!**
X4 was being discussed by Fox studio execs as late as last year. Laura Donner stated I believe in March of last year that it was still being discussed and they very much wanted to do it. X3 still made money. It just happens to be critically trashed by fans for the most part.
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Ignoring the The Last Stand since 2011.