People don't like to think of it this way, but Wikipedia is funded by ads. Except, the ads only advertise one thing: requests for donations. If people don't visit Wikipedia, because the AI regurgitated Wikipedia's answers, they won't see Wikipedia's donation ads, and they won't donate.
Over time, if current trends continue, more and more people won't even know about Wikipedia. They won't have any "warm feeling" towards the project, because they never go there, they never use it, they never see what good it does them.
Obviously they need staff and more costs than just hosting, but something isn’t adding up for me, so I stopped donating.