Not enough solar
Want a good shit hit the fan boat, look at a Amel or some of the lagoon cats and the like with the big ass solar arch on the back.
The other factor would be if you’re going to try to go inland to dodge storms, presuming the bridges work, many fixed bridges are about 50’, so a mast over 50 makes things limited, plus draft issues on the big mono hulls
The issue with the elites is their lifestyle, if things got less civil they are just big awkward money bags, easily spotted from a mile away. And if money has no value, think it’s going to be a gut check for their security, they they are always going to be having people take shots at them, not sure how the ROI on that works in a lawless and bankless society
I've not seen many deep water ocean transit vessels in service with multiple hulls.
Perhaps they will become more popular.
Role play it for yourself.
If you were in their place, what would you have in place to make sure your guards remained loyal?
I'm sure a bit of thinking will come up with several workable ideas.