This is all posturing. The Marines and the rest of the U-S military are going to stay on Okinawa as long as the central government in Tokyo wants them there. And they will want them there as long as there is a concrete regional threat. And there is a big one for the foreseeable future: the so-called Democratic Peoples Republic of Korea.
Ni Channel is the most popular rumor-mongering site in Japan. It seems a rare outlet for the incredible frustration of Japanese saddled with a docile mainstream press but, of course, much of what is written in this uncontrolled environment is unfounded, slanderous and libelous.