[bauchidgw]

well on most SEO conferences there is the agreement that a good search optimized site gets at least 90 % from its search traffic via google in the us market.

in other western markets (i.e. germany) google has a market share of 98% plus and we are fine with it.

said that, one of my sites only gets 28% of its search traffic in the us market via google, but it has a penalty on most of its pages (everything but the startpage and its blog is banned from google and with good reason) so its an outlier.