Many worlds is both simple and it fits the data. If that continues, then it will look good for many worlds. There's also the question of fruitfulness. I suspect other versions of quantum mechanics just don't make sense ultimately. But if you can keep showing that it is the most productive way of thinking about quantum mechanics, people will begin to accept it more.
Welcome to the May 2022 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). I take the large number of questions asked by Patreons, whittle them down to a more manageable size — based primarily on whether I have anything interesting to say about them, not whether the questions themselves are good — and sometimes group them together if they are about a similar topic. Enjoy!
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