I volunteer at the Rhode Island Computer Museum, and I rarely have someone ask about Sun systems. Maybe if we were in California...
Suns (server and workstation) were quite common in the late pre-commercial-internet era at universities on the east coast. My ex-wife's school had giant labs of Sun IPCs, and mine NeXTs. But much like the internet itself, most people alive at the time were not involved in it, so they wouldn't even know what to ask about. There are a ton of people who were students at the time who probably used Unix shells to access Usenet and such, and to this day have little idea what kind of computer they were actually running on. And then SGI, SGI captured a lot more mainstream attention, even if people had only a vague idea of what kind of computers they were.
If I were at a museum, I would consider it an obligation to educate people about Unix servers and workstations. And VAX/VMS for that matter, which no doubt has even less interest outside computer circles. They are just as important as IBM mainframes, and significantly more interesting IMO. People don't necessarily come in knowing already what is cool technology.
People are going to have nostalgia for what they used or at least knew about, and for most people, the internet starts with AOL on their home PC, and computers start with the Apple II at school. That a mass produced $1000-5000 (not adjusted) PC may have the same value as a $10,000-50,000 (not adjusted) workstation on the used market today may be absurd, but that's just supply and demand... All the better for those of us who know what the real prizes are.
The importance of Unix (and Sun in particular) doesn't really extended to making forums here that would be underutilized, especially when much of the discussion is taking place elsewhere. I agree with what most have said that this forum is more than adequate, and interest in Suns is extremely unlikely to
increase going forward.