I don't think it's unlikely as the myth cap will be going away. They'll basically be handing people ilvl90 gear at that point. I don't see why they couldn't implement an i70 GC gear so as it's not completely irrelevant. It seems silly that they won't be implementing new ranks for what, a year? Since they won't be raising level cap til the expansion.Unlikely as they've repeatedly said they want you to do dungeons to get higher ilevel gear. They're not going to give it away free with seals.
I stand by my statement. You'll get more ranks when they raise the cap. There are actually more ranks that we don't have access to than we do. You can see all the unavailable ranks if you click on your own rank in the character screen.