Is such an approach likely to be successful? My sense is ‘no’ if only because all trademarks could then be defended in such a way upon their expiration, invalidation, cancellation, etc., and that clearly does not seem to be the case - have an ‘major’ trademarks been defended using this approach in the last decade?
Regardless, it seems to me that allowing defence of a trademark based on “common law rights” and usage could lead to what would be essentially immortal trademarks (which, I assume, would not be allowed to happen).
“Normal”, registered trademarks are already essentially immortal, and the conditions under which they’re lost are much the same as the conditions under which a “common law trademark” would be.
You are entering very murky waters…
Prior use of a mark used to be a reasonably effective defence to an infringement allegation in the USA. But it’s not really so easy and there are many factors that may come in to play.
However, in terms of the article that you have linked to regarding the Redskins, I can say that since they are a very famous team nation-wide, anyone trying to sell unauthorized Redskins products could probably be prevented from doing so under Unfair Competition Prevention Law.
Usually you need a cause of action to sue. I’d assume you’d at least need to show you have a trademark capable of infringement before you can bring a lawsuit alleging trademark infringement.