If they had succeeded in attaching those books to the ot, that would have left basically paul's and luke's act as the nt.
My view, jesus' new religion should have been just that, a new religion, separate from the ot. It couldn't stand on it's own, however. A leaning post was necesary. That post succeeded in helping it to become a religion in its own right, at first. Later on, it became an albatross around its neck. Hence, the catholic priests playing down attention to the ot. It took protestants to pick up the withered carcass, breath life into it and cloth it in new feathers.
S