I can’t imagine what the Netherlands would look like if desertification would occur. It seems implausible that those flat, flat lands would ever turn brown and grey and dusty - but I won’t be surprised if things turn that way in a few years. I hope the Dutch have a solution, they always seem to when it comes to water control ..
I think currently one of the biggest risks for The Netherlands is salinization. If there is not enough river water and the groundwater level is too low, sea water will push upward, contaminating the river beds and increasingly much soil around it. This summer they had to close locks to block seawater and to increase the fresh water level. Of course, this has a considerable economic damage, since it blocks inland shipping.