Will Nutty Neural and Manic Moose exist simultaneously? I hate learning new interfaces.I stopped using ancestry.com once they got a new interface after I mastered the old one. It takes too much time.
I am confident that any modern interface they come up with will be easier to use than the dated MM. There has been much user feedback and pressure from the competition for Bryston to learn from.
Having said that, if you don't want to update then don't update. Since you don't use the Network connection you have no worries of an update being forced.