It's most likely to avoid losing these trademarks, since for most of them, they haven't been used in many years. It's just a normal thing for a company that releases new products constantly to do. Big Hollywood studios do them, novel publishing companies do them, and companies that make lots of different utility products like 3M do them.

Nintendo needs to do this even if it's just so these games can get mentioned in a Super Smash Bros. game or in a feature detailing the history of a franchise. They go through a bunch of trouble talking with people from King Features Syndicate to keep the trademark to the Popeye game for the NES so that it can be included on a list of NES games, for instance.

Hence, don't expect any of these games to be re-released. It'd be nice if they did, but don't get hyped because this is business as usual for a company like Nintendo.