Yeah this is pretty much spot on. With Spurs being run the way they are, the only sustainable way to increase investment in the squad is to increase revenues, at least under the leadership/philosophy of Levy and ownership of Lewis (they're not going to suddenly start throwing huge money at the squad otherwise). In the past it's been done through big money transfers out of the club, but that adds little in terms of consistency and sustainability. The stadium project and other commercial revenues are the only way to really add any staying power to the equation.
In this football era of big money and investment for clubs like Spurs it's either join the trend or risk getting left behind. In some cases it's teams having owners who are willing to put money in the squad without any real sustainable ROI and in others, as with Spurs, it's finding ways to increase your revenue footprint to allow for an increase in your financial parameters (wages, transfer fees, etc.). Either way the end game is the same....spending more money to keep up with the seemingly limitless trends of today's football market.
I'd love nothing more than to believe Spurs can one day in the near future win the league by maintaining the approach of value signings and youth development, but is that reality? I suppose there is a very slim chance it could happen this year, but long term it's not a strategy that will consistently lead (Leicester being the ultimate one-off, perfect-storm-type story) to the results the fans and front office are looking for. At least not in the footballing world we live in today.
Still think we've got a good shot at top 4 this year