The simple answer is... probably not. One of the purposes in identifying "prior art" is to help guide the examiner regarding the history of patents in that field and how the new patent creates something new, novel and unique in an area that is related. The new patent, if granted, would not by definition require license. However, their method may benefit from integration of those other/previous technologies to get to that point of their patent. In essense if their are only practicing their patent, if granted, then by definition they are not infringing.

At least this is my understanding from patents I have been involved with.