Merc was successful with the combined flow pump they sell to Bombardier. This year it has an Optimax power head on it. One member of the audience kept asking about bigger jets. OMC - Yes, Kerosine. Merc - Hydrogen and LP are distribution oriented.
Direct injection is more friendly to alternative fuels.
The marine industry will follow automotive fuel distribution. They watch octane very carefully or people would get in trouble with normal pump gas. Originally the industry was really worried about the cost of four-strokes and DFI, but despite the price tag, people are buying them. The customer gets fuel economy payback and they run better. New 8.1 has PCM 555 controller with and uplink to the smart gauges.