You are limiting the club with this train of thought really. Spend £50/100m giving the old girl a glow up, and still hit revenues for 23 days a year.
I can only surmise the people that don't want to move are because of selfish reasons. Ie the journey in is 10 minutes on the bus, or they are sentimental fans. No fan wishing the club to progress would want us to stay and throw money at a ground that is literally in a flood zone.
I just cannot understand the argument to stay.
Think bigger.