Note:I've clearly left the safety of my knowledge with these comments. Please see these as an aim towards constructive conversation.
Well, it's possible that I am biased in a pro-US position, but to me I see the club (any club really) advancing in two ways:
Model A) Mega-bucks owner sees the club as his toy and is willing to invest countless sums into the club without ever expecting to see a return realized
Model B) Club develops a corporate brand presence that generates its own revenue streams in sufficient sums to finance club expansion and generate a profit
Personally, I don't care if either can bring success to my club in the short term, but the second model is a much more sound business model. In fact, the first model only works when/so long as the Mega-bucks owner finds the club a useful toy. When he tires of the club, he focuses on a new toy (i.e., bunga-bunga parties) and the club may suffer for that. In reality, many clubs are a mixture of each model, but not all attempts work out. Ask Randy Lerner what he thinks about this. The reality is that running a club is a big task, and much different from what I've seen with US clubs, which are protected from relegation and with revenue-sharing that is more egalitarian than PL standards. The difficulty with the PL is that whereas in US sports competition is not a zero-sum game, a PL club must face the reality that one club's success often actively harms other clubs.
But some clubs have done very well in this regard. It remains to be seen what happens with United, and currently City and Chelsea are failing miserably as businesses, but Arsenal, despite all my dislike for them as a club, seem to have mastered the business model of running a PL club. Whether they can translate this into honors is a different matter.
I think if Everton are to advance as a business (a business that is able to provide the resources required to add to the cabinet) it must develop Model B. Model A is only a short-term solution.