One of the obstacles of implementing pro-poor tourism is there is no clear tourism product; there must be a distinct tourism product.
It could be ecotourism; wildlife viewing, river rafting etc. The presence of a distinct tourism product will enable places to have a clear identity.
Another, is that locals may have resistance towards tourism in their area. Read the below article to understand a little better how sometimes locals may exhibit reluctance or straight out resistance against the presence of tourists. https://www.theguardian.com/environment/2015/mar/11/ecotourism-amazon-shortchanges-locals-ecuador