Is that actually true? In my research, i found that a number of scholars (including the ones you cite) critiqued aspects of Piketty's theory, but their papers read like either additions or clarifications. Further, the results are definitely not "convenient" - indeed, they go against a lot of prior research, and Piketty has done a remarkable job being open with both the data he uses and responding to others' arguments. He has certainly started an important scholarly debate.

If I'm wrong, mind citing the correct sources?