Replication is unpaid QA on someone else's product. Nobody gets tenure for finding the bug, hence the field has been meaning to get around to it for 20 years.

On the other hand, this seems like a super interesting path for an (unglamorous) PhD -- replicate the N most important findings in a field, subject to some restrictions (maybe focus on the ones that are "easy", or haven't been replicated yet, or the ones that could be patched together to make an acceptable PhD thesis). This sort of stuff really appeals to me, I think I might end up doing something like that in 5-10 years.