but how much generic traffic is actually coming from yahoo on your sites ?? the vast majority of my yahoo traffic is from Yahoo!image.search, RSS feeds and yahoo email accounts (links forwarded) and only a tiny % Y search overall I have more than 150% the traffic from Yandex than Yahoo and more than twice the Yahoo traffic from my most active social network (NON-FB)
to "like" Google is fine - and I do also as wel as millions of others ... but as a business man or web site owner you never ever should depend on a single SE as source of traffic or customers
Of course, Google is always first search engine in my list and Yahoo is second option of search engine.
Google is first in my opinion and a question for you: why are you opening this kind of topic everyday?
Did you ever used Bing? Its becoming my friend because more accurate results and my sites ranking good in BING