That's a very extreme case and not a good example of burn-in from typical use. It's most likely a store demo unit that's running at high/max brightness with plenty of static images for hours each day. I used to have an OLED Android phone (original Moto X) for 2 years and I didn't have any burn-in issues like that. The Touchbar already runs at a pretty low brightness and it could be possible that Apple has built in automatic pixel-shifting to try and offset any potential burn-in issues.It looks like this. But I think this is a store unit that has been on for a few months at high brightness. We don't really know how it's going to look like on the touch bar. I've also seen a Nokia Lumia phone that was even worse than this in a store.
This is what Android users with OLED screens have to do to prevent burn-in http://www.makeuseof.com/tag/save-screen-prevent-burn-in-amoled-screens/.
However, it is likely that the colors could lose some of their saturation over several years as the OLED pixels age (my Moto X did do this but it was subtle). Given the narrow purpose the Touchbar serves I wouldn't say that's too big an issue for resale value. After all it's not like we're editing photos on the Touchbar.