While at today's TCA Kevin Feige commented about making more adult-oriented entertainment for streaming in the MCU. He led on that "Deadpool" may have more life left in it.
When asked about the upcoming adult-oriented content, Feige said, "I think we target everything we're doing for kids and adults, so I think your question is more adult or R-rated. Other than Deadpool, which has already established itself as a certain genre and a certain rating, that we already said we would not mess with when we started working on Deadpool - which we have - other than that, we haven't encountered a story or a storyline or a character's journey that a PG-13, or the tone, or the ratings we've been using up to this point has prevented us. We haven't been held back by. If we ever are, then certainly there can be a discussion that can be had now that there's other outlets like Star. But that just hasn't been the case. We've told all the stories that we wanted to with the tonality and the rating we have now."
It was being reported back in October that a "Deadpool 3" film was being written.