The music rights issue with Macross 7 is cost prohibitive. This is one subject that has been covered here ad nauseam over the past decade. DYRL, as we all know, is in legal limbo; no one really knows who owns what. Plus and II are essentially being kept down by the company that holds the rights to it. It's a small crime that a high quality release of Plus has yet to happen. Frontier, I would think, should not be much of an issue.
As far as games and publications go, I think Seto is expecting a wee bit too much. Only one game was ever planned to be released here, and there isn't a chance in hell--even if HG wasn't in the way--that any of those games would be localized and released here now. And I do not believe there is a big enough market outside of Japan to justify the kind of release of books and magazines that he is looking for.