Good post mate.
There's definitely an investment case for a new stadium and also one for a redeveloped Goodison, particularly when there are significant capacity and revenue constraints on the existing asset. Admittedly the initial return on capital is fairly low, but as you yourself point out it can significantly increase the asset value of the club.
Previously I have shown that a stadium with capacity of 50,000 including around 4000 executive seats could at capacity increase existing revenues from less than £20 million to £35/38 million without eye watering increases in ordinary or concession seating. If you add in the reduced running costs of a new stadium then you begin to see an acceptable return on say investment of upto £250 million.
We puny humans are not a lot dislike nature. In nature a young bush grows steadily, accelerates into full bushy maturity then after a while starts getting woody and bald in the middle, before the outer branches look straggly.
I would argue that football as a pass-time is in its full bushy maturity .... but in the future (x years) as people start getting fed up of the procession that is the wealthy elite mopping up - and as passion is strangled from the game in the need to manufacture the same old teams into the "champions" league, I can see football slowly becoming more straggly, as more and more people give up on paying the high prices to see the same old business run rubbish.
How would this new huge stadium look with around 10k supporters in it, in the future? Will football in the UK go the same was as baseball in the US?