Some other thoughts about the MWI, that come to my mind after a bit more thinking:

Here is a version of the Schroedinger's cat experiment that would let anyone to test the MWI for himself: Let us devise a quantum process that has 99 percent probability of releasing a nerve-gas in a room that kills humans without any pain. If I'd be really sure of the MWI, I would have no problems going into the room and press the button to start the experiment. In my own experience I would simply come out of the room unscratched for certain as it will be the only world I would experience. OTOH, if I really get out of the room as if nothing happened I could deduce with high probability that the MWI is correct. (If not: just repeat the experiment for a couple of times...)

I must admit, I am not really keen on doing the experiment. Why? Am I really so unconvinced about the MWI? What are my reasons not to perform it, even if I'd be 100% sure?

Another variation of the above line of thoght: assume that we are in 2020 and we say that since 2008, year after year, the Large Hadron Collider had all kind of random-looking technical defects that prevented it from performing the planned experiments in the 7Tv scale. Finally a physicist comes up with a convincing calculation showing that the probability that the collider will produce a black hole is much much higher than anticipated and the chances that the earth is destroyed are significant.

Would it be a convincing demonstration of the MWI? Even without the calculation, should we insist on trying to fix the LHC, if we experience the pattern of its breaking down for years?

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