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Much of the consideration of Dynamic Spectrum Access has been focused on its ability to provide secondary spectrum sharing without any impact on primary users of the spectrum. It has been typically assumed that these benefits would be exploited for unlicensed, or secondary uses of spectrum. This paper argues that the benefits of DSA are significant, even for licensed users, and that DSA regimes could offer both benefits to primary users, while creating opportunities for secondary sharing. Such a regime might avoid "zero-sum" contention over establishing DSA policies. It is further pointed out that interference mechanisms are being included in the design of emerging wireless technology, and that these features constitute a homogeneous version of DSA. The extension of these to heterogeneous uses is a logical next step.