I'd love to see this site remaining the premier course review site for years to come. All one has to do is track the infrequency of new reviews (even with new courses popping up all over the place) to see something needs to be done to get that to happen. It's not a complaint, merely an observation.
I think it will remain the premier source of quality course reviews -- and detailed course information. At least for the foreseeable future.
I'm not sure what could be done to both maintain that quality, and increase the number of reviews, in a world where phones have overtaken desktops. Given that choice, I'd rather have the quality.
Perhaps some public service messages, on the home page or in mass PMs, imploring people to support this institution by doing more reviews?