“Do you have a plan in place if your display manufacturer either goes out of business or quits providing certain parts?”
It’s very important to take the manufacturer’s product lifecycles into consideration when developing display hardware standards and your own equipment lifecycles. For standard non-interactive displays, we update our hardware standards every nine to twelve months to reflect the current commercial display models on offer by the manufacturers we use. These devices have a three-year warranty, so we know parts will be available for at least that long.
We have encountered issues as display sizes have changed over time, however. Some of our freestanding kiosk enclosures purchased from around 2013 to 2015 used 40-inch touch displays, and that size is no longer commonly available. We moved to 55-inch displays instead since that size has been available for a longer period of time. This does require replacing the kiosks though, and so kiosks/mounts also need to be a consideration.
Lastly, for some of the highly specialized implementations, like LED video walls, we’ve purchased extra parts and panels along with the equipment being installed. That way, we have at least some guaranteed amount of extra parts on hand.