Let's be clear here. The target of article's criticism was not the evangelical side of this unusual "ecumenism," but rather the cultural warrior Catholic side. It is the narrow focus of these Catholics, primarily its episcopal leaders, the Francis would like to call back to a balance view of Catholicism, preferably in his image of the social gospel. 

Not only is it out of place for the Vatican to chastise the evangelical side, but were the core Catholic disagreement with that version of Christianity, the critique would be about how to read scripture. 

Francis being Francis, he may well take the meeting. What he might do with the occasion is difficult to predict.