I don't see it really differently. Of course, it won't be mandatory but LocalCryptos itself (and the 'trusted attestors') can be the point of failure.
localcryptos cannot be a point of failure since they will never see your ID documents.
yes, the trusted attestor can be a point of failure. the alternative is to send your ID documents to every single person you trade with. which one is the better solution?
If the financial authorities, or whatsoever, ask the website to perform the KYC verification for all clients, it won't really be able to do it as described, because the site will be supposed to be able to give any information about any client, any trade, at any time. So Localcryptos won't be able to say "we can't, it's done by our 'trusted attestors and we have no access'
They will simply reply 'it's not our business, deal with it and obey' or close the shop
only if the laws are drastically changed. as squatter pointed out earlier, localcryptos doesn't appear to legally qualify as a "digital currency exchange" so they are not subject to those requirements.
i'm still skeptical of the whole attestor marketplace thing and will probably just stick to p2p cash trading without ID, but it's still a cool solution to a shitty problem.