traffic falling means wikipedia will be cheaper to run. since they don’t rely on ads, it’d likely not affecting their revenues either (assuming those who don’t use it anymore weren’5 those givîng to it)
It’s probably not good long term for donations or attracting future editors. Possibly less people interested in editing when it becomes more unpaid work for AI companies than actually serving real viewers.
If I may speculate I would assume that the Venn diagram between people moving from wikipedia consumer to tiktok and AI generally don't overlap much with people prone to contribute or donate to wikipedia, so I'm not certain it's a net loss in that regard.