With current per port costs and economics, that doesn't make much sense. The $/Gbps/Watt improves with every spin of the chip, and every increase in serdes band

With current per port costs and economics, that doesn't make much sense. The $/Gbps/Watt improves with every spin of the chip, and every increase in serdes bandwidth. 10GbE (64x10G) - ~$4,500, $70/port 10GbE (32x40G) - ~$6,000, $50/port 25GbE (72x25G) - ~$7,000, $100/port (Seen as low as $5k) 25GbE (32x100G) - ~$9,000, $75/port (Seen as low as $7k) 2x 10GbE = $100 1x 25GbE = $75 Not to mention the extra cabling costs, and complexity.