As usual, a solution looking for a problem.
And just like ever, asking the péloton a loaded question in such a manner leads to a biased conclusion. With riders knowing that they don't have to expend any energy in the last 5km, they can just sit up and soft-pedal, and we have literally reached the Paris-Dakar system of having set racing sections and set liaison sections which are just untimed kilometres logged for reliability purpose to get from town to town. I mean, the question is, at its crux as far as many of those riders are concerned, "would you like to have to do slightly less work?" - I mean, if somebody asks me that kind of qustion I'm saying yes!
As ever, the problem that they have isolated this as a solution for is not one that could not be solved without any fundamental changes in how cycling is scored or taken. Stricter rules - and actually enforcing them - about acceptable finishes in stages expected to end with a bunch finish, would go a long way. It might hurt some town councils who want the still photos of their bunch finish with some landmark in the background (this is the notorious problem the Women's Tour has had with many paid hosts wanting a sprint finish thinking this automatically means excitement, but also wanting to show off the town/city leading to some ridiculously over-technical finishes that simply cannot sustain a full péloton without danger) and need to perhaps relocate the finish to some edge-of-town industrial estate where the need for those roads to sustain haulage traffic means that they are wide enough and straight enough for a sprint to be conducted safely... but that's an easier price to pay than abandoning time gain for some stages. The point of a bike race is that you race from one place to another and any point in between is a place where you can gain time. Road cycling isn't scored on placement except in a tie break. It's scored on time, so telling riders certain parts of the course are off-limits for gaining time instantly renders them worthless.
Again - if they want to extend the 3km rule to 5km, then that is a much better - and much simpler - solution in my book.
And as I mentioned with my Keith Yandle comparison a while back, it's kind of funny that once Adam Hansen was this highly respected toughman of the péloton, when late in his career he turned into a charity case who rails against anything that looks too much like hard work.