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All these accusations, hairsplitting and the pissing match who knows most about SEO and who is right will lead nowhere and help noone.
We all agree that PR and rankings are not directly related, but PR isn't totally irrelevant since many people rely on it for link trading, as an indicator. Overvalued, but still an indicator how much google values a certain site.
Now, if this indicator drops for alot or even the majority of sites, it could mean two things:
1. A general global change, so we just need to get used to it without consequences.
2. A devaluation of certain factors common to loads of sites.
So, if there is a chance that 2. is true, it's necessary to figure out what's the reason since I wouldn't want to wait until rankings maybe affected as well. Just sitting there and saying what was true for the last 5 years will be true forever means relying on proven facts, but as soon as the facts change you are fucked.
There are sites, especially directories, that dropped from 5/6/7 to 0, they may still get the same traffic, but assuming a change like this won't ever affect the SERPS long term is pretty risky in my opinion.
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