The final straw was noticing a comment referring to "the most recent survey I know of" and realizing it was from May 2009. I think it is well past time for another survey, so here is one now.
I've tried to keep the structure of the last survey intact so it will be easy to compare results and see changes over time, but there were a few problems with the last survey that required changes, and a few questions from the last survey that just didn't apply as much anymore (how many people have strong feelings on Three Worlds Collide these days?)
Please try to give serious answers that are easy to process by computer (see the introduction). And please let me know as soon as possible if there are any security problems (people other than me who can access the data) or any absolutely awful questions.
I will probably run the survey for about a month unless new people stop responding well before that. Like the last survey, I'll try to calculate some results myself and release the raw data (minus the people who want to keep theirs private) for anyone else who wants to examine it.
Like the last survey, if you take it and post that you took it here, I will upvote you, and I hope other people will upvote you too.
Is this an explicit premise of MWI, or is it a logical consequence of the premises, or is it based on current technology and understanding?
Even if it is one of the first two, suppose all other interpretations made testable predictions. Would the question asking one to estimate the chances MWI is correct be useful?
It's a logical consequence of the premises. The instant there's a split, all branches except the one you're in become totally and permanently unreachable by any means whatever. If they did not, the conservation laws would be violated.
If all other interpretations made testable predictions, it wouldn't be enough unless you could somehow eliminate any possibility that didn't make the list because nobody's thought of it yet. It's like the fallacy in Pascal's Wager: all possible religions belong in the hat.