I like to think of the wish list as like the LEGO ideas community. In that community, you can submit an idea for the next LEGO set that LEGO should build and sell. If your idea gets 10,000 votes then it will be passed along to the LEGO staff for review.
After review, they reveal which sets will become a reality and which didn’t make the cut and they explain why.
There are a lot of things that need to be considered before agreeing or disagreeing to work on a wish list item. While I personally wish for a lot of the wish list items to be launched soon, I think many people prefer to have a stable design product instead of something that is rushed.
Also, if an item that you submitted or voted for doesn’t make it to the product now, it doesn’t mean it will not be considered to be added in the future.