Totally agree. Of all the blunders Disney has made in their mishandling of the Star Wars franchise, one of the more surprising has been their myopic approach to merchandising. Just think of the in-park and in-store merchandising tie-ins had Disney included Luke's New Jedi Order in the ST (something a lot of fans wanted to see). Not that merchandising needs should influence movie storytelling, but this is Star Wars after all (*ahem* Jar Jar, Ewoks, etc.).
They could have housed the lightsaber building experience in a fully realized Jedi Academy, which would have provided ample space for saber making. They could have sold robes, holcrons - all in one place! It could have been Disney Hogwarts. The checks write themselves!!