There are a lot of different gear in use. Most platforms on the top level is no doubt Marstrøm, but the gear on the boats differ. There are custom centerboards, spi poles, rigging layouts, booms etc. etc. in the current top level fleet. If you move down in the fleets you find different platforms still being raced. I would not say that most use Ullman sails. Gran Segel and Landenberger seem to dominate the spi market. Landenberger and Olympic are doing jibs and mains which many boats use.
Going SMOD removes the option for homebuilding, fixing and rigging. I would say there still is a large jump for the Tornado to go from the current ruleset to full SMOD.

If they moved for a full SMOD, I think Gøran would supply the boats for the games. He loves the boat/class.

Until we see a proposal from the ITA or get more details, it is hard to guess what they are proposing.