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A platform change decision comes down to how much value you get (or the cost of not changing) vs. the cost of the change. For most people the cost of switching to HTML5 will be trivial, so the long-term benefit of merely being ready to use more features is enough payoff…
The In and Outs Of HTML5 Switch As Seen By Ben Buchanan. A well elaborated article starting from html5 usage to changing to html5 doctypes.