>>I don't know, "couldn't replicate this other major study" seems like it would qualify as outstanding scientific importance. It all depends how you frame "scientific importance". Replication seems like it should be high on the list of scientific goals.

You're missing the other side of it. Here's what's not interesting: Replicating the results of a study already believed to be accurate. Yet it is vitally important.

But does it need to be published in the same venue as the original research? Maybe each journal should have a counterpart for replication attempts. Then you can read about stuff you probably haven't heard before in the main publication and go look for replications in the other.