So here it is. We have NO intention of letting this viewer die. We will have mesh - can't promise it'll be quite in time, but it will be there soon. As for other changes which can impact viewer functionality - if it's moderately easy, we'll fix it as soon as the problem appears. If not, we wait for a few days to figure out what Lindens are doing and whether we can expect them to fix it on their end, but in general, expect us to figure out a solution to any upcoming problem, with perhaps a few days of pain in between.
Here is a more elaborate write-up on this topic.
Stay tough, stay singular!