Haha, I love the quote and the fact that it's always resurrected every couple of months.
In my view and as it stands, "crapness" is defined only by the band U2 themselves, and I sense that their definition of crap only really applies to PoP (talk of redoing it, de-boomchaisation of the mixes for 90-00), which means ATYCLB was the most crucial album for the band, and from all reports, they seem pretty pleased with that album, so they understandably kept on going.
They also seem pretty pleased with NLOTH, and Larry I reckon is the key player here. He really does run the band in my opinion, and he seems pretty happy with NLOTH so going by the maligned "2 albums and we're out" theory, they've got at least 2 albums left in them.
I do wonder how they feel about HTDDAB though, might need to research that....look for some negativity.
It is just a theory though, but I find it fun to think about...