Ad funding would never stop because people wanting to make money off content would never stop - it just becomes more subtle. Think sponsored posts, product placement, added bias.

Imagine a plain text blog run by an individual, good quality technical content, and a company comes and offers $10k to write a blog post about their product after trying it. If the author decides not to disclose the financial motivation, you now have a subtle biased funded advert that no adblocker will save you from.