Flash taking over?

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This is a simple question but I want enough feedback to make a informed decision in the future. While I think it is important to keep up to speed on multiple languages and techniques with web design, it seems as though a majority of the ‘major’ website’s these days are being taken over by entire flash sites. So I guess my question is, should I concentrate my learning on Flash to keep up to speed with the industry or is this just a ‘flashy’ (no pun intended) time consuming, pricy solution for large scale sites? Everyone’s opinion is of value…