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How do you think YouTube would have got on if they'd have changed their URL to watchvideosfreeonline.com
or LonelyPlanet.com to traveldestinationsinformation.com
All depends on the goals, if it's short term SEO gain then maybe, but even then probably not.
The extra ranking help that might seem to be there from a keyword in the domain name is not as big a factor as it might seem at first, at least not from what I can see. Today's algorithm is not so simplistic, and tomorrow's algorithm will be even less so.