What if the only hospice in town closes down and your grandma is there? What if Mozilla or Linux die out and the only browsers/OSs that remain are proprietary? You find alternatives or make do, like all aspects of life.
You can't expect services and organizations to last forever, there is always some risk they'll collapse when you are around.
But is it too much to ask to at least let me get my grandma back out of the hospice? Don't just lock all the doors and put up a sign saying "Thanks for your loyal business, it's been an amazing journey". And if I'm the one who owns the building and you were just staffing it, then I'd appreciate having the door keys back as well, please!