Thus, evenually, we'll wind up back exactly where we are today. Instead of strains W, X, Y, and Z infecting a large percentage of the populace, Strains Y and Z just will expand to cover the new gap.
"But, but, but...if it can help, 'just a little', isn't it worthwhile?" In this case, I'd say "what's the difference?". The end result will be the same, people will have wasted an enormous amount of effort to no gain, and, I'd imagine that human behavior being what it is, the 'non resistant' strains will spread like wildfire, since people think that they're "covered".
Wonder what the law of unintended consequences will bring to this particular party? What if strains W and X didn't cause cancer, but Y and Z did?
I agree with you (I think), this is a bad idea all-around.
Yes, it is a bad idea all around, and I agree with the poster who observed that only a tiny fraction of whatever was spent would actually contribute to vaccination, so that even if the vaccine were incredibly effective, it would reach only a small portion of the most needy population.
A much better value would be getting more Africans to accept polio and tetanus vaccines.