58k is not a small stadium but it's not a big one either and it's the best we can ever do.
If we were say villa or Sunderland you could probably get away with it. But Liverpool is one if the biggest clubs in the world. Vish makes a lot of predictions about football in the next 50 years but he no more knows than anyone.
The new stadium would allow Liverpool to grow as football changes (or not) it's the flexibility for our long term future we are buying and it's a price worth paying in my opinion
A lot of things can happen in the next 50 years, you don't know neither, let's sort out the next 15 first. We need to regenerate the worldwide fan base starting yesterday not the stadium to be used may be in 15 years. A brand new stadium would mean no trophies for 10 years and probably no CL, looks like you would prefer that.