So you do feel that eventually people will wise up and start questioning the status quo, at which point people will stop denying the truth of the FE. Do you have any guess as to how long it might be until people wise up and start questioning the status quo?
People are starting to wise up right now. The Flat Earth movement is getting more and more popular by the day. People are performing Rowbotham's water convexity tests on YouTube and seeing a Flat Earth. I have even seen a bunch of experiments on YouTube supporting Rowbotham's more minor ideas that the moon produces "cold light". There are a ton of Flat Earth Podcasts now. More and more people are realizing that Rowbotham was right after all.
The movement will continue to grow. The movement will get more exposure in the media. There will be more experiments. People will organize the experiments and the evidence, and present it for easy digestion. At some point there will be so much evidence that the establishment could not resist debating us. Prominent figures like Bill Nye the Science Guy will feel a personal responsibility to defend the Round Earth Theory in high profile online debates. It will just take a single instance of their fall from grace to open the flood.
Once the flood happens and we have tens of thousands of people seeking the truth, the truth will be found, and it will be undeniable. All of the experiments we want to do, but can't due to funding, will be performed organically. In the meantime we must work on our theories, our philosophies, and our materials, to provide a solid starting point for curious minds to flourish.
However, even despite all of this, Flat Earth Theory will still always be a niche topic, obvious only to those motivated enough to investigate it, so long as the government continues to fake space travel. A greater political revolution to fight corruption would be needed to change that.