What I think is overlooked in this discussion as that a lot of confirmation work already happens. Most (all?) scientific results are incremental progress built on a heap of previous work. In the course of normal research, you reproduce existing results as necessary before altering conditions for your own study. If you can't confirm the results, well then perhaps you have a paper (though it can be politically challenging to get it published, and that's a separate problem). But if you do, then you don't waste time publishing that, you get on with the new stuff.
Ultimately, I don't think scientists do accept results in their field that they have not repeated.