They argue that the world has entered a post-AIDS era in which the disease's spread has largely been curbed in much of the world, Africa excepted.

"AIDS is a terrible humanitarian tragedy, but it's just one of many terrible humanitarian tragedies," said Jeremy Shiffman, who studies health spending at Syracuse University.

Roger England of Health Systems Workshop, a think tank based in the Caribbean island of Grenada, goes further. He argues that UNAIDS, the U.N. agency leading the fight against the disease, has outlived its purpose and should be disbanded.

Paul de Lay, a director at UNAIDS, disagrees. It's valid to question AIDS' place in the world's priorities, he says, but insists the turnaround is very recent and it would be wrong to think the epidemic is under control.