The number of flows in hardware switches (dictated by the underlying TCAM size) is one of the major roadblocks in a large-scale OpenFlow deployment. Vendors are supposedly making progress, with Intel claiming up to 4000 12-tuple flow entries in their new Ethernet Switch FM6700 series. Is that good enough? As always, it depends.
TL&DR summary: Use switches that support OpenFlow 1.3.
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