Starts around 29 minute mark (more comments at 1hr 3 minute mark).
Very interesting how the presenter Says the market will reside in the 400g areas for awhile so the equipment providers can get a return on their investments and he keeps on this theme because we well know Cisco has spent a lot of money to get to this point, so then they'll try to milk it as long as they can.
https://youtu.be/aiUSlfxP1z0
SP