I had no problem understanding it.
He doesn't really say anything about the future. He says that way back in the Star Wars time period George asked him if he'd appear in ep 9, handing his lightsaber down to some new Jedi much the way Obi-Wan passed knowledge to him. When he asked George when ep 9 would be shooting, George said about 2001 or so, and Mark noted that at his age it was a big deal to wonder what he'd be doing 26 years later.
He said that George had orginally planned 4 trilogies. He said that George got tired it it, and implied that George wasn't planning for anything beyond ep 6.
There was plenty of interesting stuff, though. He talked about the cast feeling a sense of ownership over their stuff, like him not wanting characters in some future movie to be using "his" lightsaber, and Harrison not wanting other people to be using "his" wookie. He said that he certainly never dreamed that he'd still be talking about it all today. Plus other stuff.