Hmmm! What nobody has mentioned is that there are several different Tickets. To pick up and set down passengers one needs a "Waterman/Freeman" ticket. To travel the tidal Thames with passengers but with no pickup/set down a B.o.T Boatman's will do, to navigate commercial vessels depending on size there are a variety of Tickets ranging from nothing through to a Master Mariner. Then some tickets allow holder as far as Lower Hope, the whole thing is a minefield. Some rules date back to 'Enery the 8th.
My personal take is "if it ain't broke don't fix it." The Marchionesse disaster was a tragedy but look at it perspective. It is the first disaster since 1895 (?) when a passenger steamer got hit in the fog waaay downstream. I have personal knowledge of how it occurred despite the Tapes being missing. No legislation in the world would have stopped it, gross mistakes were made and the full truth never got aired.
I agree with Byron.
Why can't government keep their noses out of things about which they know nothing.
I don't want a spotty 18 year old driving me around London's river.