If they want it to succeed, they need to continue to support and beef up the BRP SRD, hire some quality artists like Poag, Gary Chalk, etc. and put out some quality, well organized, nicely laid out products with that old-school flair. Plenty of guys in the OSR would be up for producing stuff under the OGL, and BRP could certainly claim its rightful place amongst the titans of the old-school movement. Also, with Call of Cthulhu being the second most played game on Roll20, there are plenty of potential converts that could be lured away from 5E that are already familiar with the d100 system. The customers are out there, Chaosium just needs to improve their marketing game.