Create a "Known current issues" section somewhere on the website.
To save multiple reports being made on problems - as is being experienced with the 1900 US Census collection at the moment - can there not be somewhere (users could be made aware of) that will carry acknowledgments of known, current issues to be found on the FamilySearch website?
Perhaps a regularly updated section in the Blog, or on a page closer to where the problem is occurring. Okay, so that would mean not one, specific place on the website - but anything is better than the current situation of being (generally) unsure if anyone is actually aware of the matter and is currently working on a fix.
No need for any estimated times for fixes, etc., just an acknowledgment that the engineers are aware of an issue and are working as fast as possible to fix it.