What I'm waiting for is for foils to become useful. It doesn't make sense to (only) replace energy source, drag should be minimized too. Admittedly it will take a long time for technology to be ready for these huge ships though.
There are already lots of hydrofoil passenger ferries where passengers pay a lot less than a plane ticket but more than a slow monohull ferry ticket to get to a destination a bit more quickly.
On land, you might send something across the country at 60 mph on a truck for $0.4 per ton if you don't want to wait for rail or pay for air, but as far as I know, no such middle ground exists for ocean freight.
There are certainly customers who can't afford and don't need next-day air, but would pay more to get components in perhaps 5 days (60 mph hydrofoil, 6000 mile Pacific crossing, plus a day to load/unload) instead of 5-8 weeks, if there was a business that catered to that.