90,000 purpose built stadium at speke that will fine. We will indisputably be the best club in the world with our fan base. As for business sense anyone with any business sense would never invest in football any investor has to be a vanity project or commercial branding thing. So either an individual, a nation, or a corporation the size of Amazon, etc.
We can dream
I understand that to build a covered stadium with more than 65k seats is a step change in costs, this is why most new stadiums are less than 65k seats