I think the Bank's own mission statement -A World without poverty- answers the question in the title. Whether the Bank will successfully adapt to this new situation where there "bottom million" are scattered in different countries is another story. Also, that "graduation" threshold is silly and should be put to rest, together with the term "graduation" itself. The Bank should have a more continuous treatment of counties that need not be linear... which calls into question the separation between IDA and IBRD. But maybe that's too much to ask?