In the UK alone, I think the number will surprise you. Anecdotally, so the obvious caveats apply, I work with at least two people who are unvaccinated and are avid listeners of Rogan's podcasts, they are the only two people unvaxxed on our floor in the office. They will also tell you the reasons why they are unvaxxed and they pretty much come out with all the same arguments you'll find said on Rogan's show. They'll also tell you that it has helped them form their opinion.
There may not be many in the older generations in the UK but the younger you get, I think the number may be quite illuminating.
In the USA, I imagine that number to be much higher and in much more widespread age groups
Just my impression of things though