Its interesting that your lawyer-ly quote is a quote from a press release statement from the plaintiff's lawyer... of course it'd sound favorable to the plaintiff. (If a judge made the statement, it might have some limited weight, but as it is, it just means someone made money, not law.)
This was also settled out of court, not precedence setting. There is precedence however, for cases being decided on considerations of its "chilling effect." (Imagine the "chilling effect" that invalidating every single use-granting license of every WordPress user on the planet would have. How mad must a judge be to turn such a large portion of the content of the internet into infringing evidence and it's creators into criminals?) To avoid this chilling effect, a different interpretation is preferred.
This is the sticking point. In your interpretation, there is no circumstance that the end-user can "remain in full compliance" and so why have the phrase at all? (Unless it was some sort of weird chronological clarification which explicitly states that someone in the future breaking the terms doesn't retroactively revoke end-user rights but that seems just a bit absurd, frankly.)
This can be done by interpreting "remain in full compliance" clause as stating that the end-user never lost rights and has had continuous rights regardless of the state of the intermediate party's behavior; it's the explicit clause that states such, because the phrase itself was even included at all. This particular interpretation makes much more sense then the alternative when considering that the copyright holder is granting the rights to the receiver of the license directly, and not in a must-not-be-broken chain of granting-ness.
The argument could go something like, "since the word 'remain,' a word implying 'uninterrupted,' was deliberately chosen in the phrase 'remain in full compliance,' we find that the end-user's rights are not impacted in anyway by an intermediaries rights or loss thereof..." This interpretation neatly solves the whole riddle does it not?
The end-user can't even violate the GPL granted rights until if/when she attempts to do some COPYING, DISTRIBUTION AND MODIFICATION of the offending code. (Seriously, you've only got to consider the license when packaging it up.) No matter how un-GPL the package is when you receive the copy, you are still granted usage rights to the GPL portions.
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