Entertaining enough - but hasn't the franchise run its course?

Rating: Null/10 (4 January 2015)

Film franchises normally churn out movies every two or three years, but there was a five year gap between "MIB1" and "MIB2" and then a ten year interval between "MIB2" and "MIB3". Maybe three-time director Barry Sonnenfeld was looking for another cinematic hit after spending most of his time on television work.
This time, though, Tommy Lee Jones has clearly lost interest because he only appears at the beginning and the end, passing the role of his younger (1969) self to Josh Bolin in a caper which combines weird creatures with time travel. It's passably entertaining but I would have thought that the franchise has run its course if I didn't know that "MIB4" is in development.