Now, in practice I would expect that you get off easier on a paper with a ridiculous number of authors such as this one as long as you find the perpetrator or a fall guy. Lastly, there is also the issue of papers at time being submitted without the consent of a co-author (possibly without them even knowing of the paper), which could complicate the matter further.
Shame on whoever did this, among the authors from prestigious institutions such as these there ought to be at least one to stop this kind of stupidity or at the very least be competent enough to write the very same text without copying.
Edit: also take into account plenty of these researchers write English as second or third language. Copied text won't necessarily sound as obviously out of place and process becomes even more important.
Sure, the end result on the consumer's trust in the science is the same regardless of why the deficiency occurred, but the problem is far more tractable if it results from sloppy QA (or equivalently calibration error and calculation issues) rather than malevolence. In the first case the researchers can eat some crow and do better science next time; in the second you have people who flat out don't belong in science.
I don't think all co-authors are equally culpable in this. The paper should be retracted, but the punishment should be only to the actual perpetrator.