Boaters questionaire

I would think that boaters in London are most likely to be pressurised to move away from smokeless fuels, logs, diesel engines, if banned, then I assume narrowboats will become less populous.Electric outboards and batteries would seem to be vulnerable to theft. Not sure what effect there would be on the market values.
I think those who are short of cash will have to sell their boats, no way would it seem economic to install electric motors, and of course it would be quite expensive to install electric points where boats moor up.