Whilst i understand where Nick is coming from he appears to be forgetting the fundamental issue with those circumstances. We would have to be either...
A) Development Club - Have a business model to buy cheap, nurture talent, perform as a team (compete for titles or good runs in CL) and then sell on - think Ajax, Dortmund, RB Leipzig, Athletico etc.
B) Successful Club - sell players who have contributed to success but either seeking to leave for a boyhood dream or are being rotated out through squad development - e.g Liverpool, City, Bayern, Real.
Nick appears to be forgetting that we do not see ourselves as a development club - we want to be the place people come to play their careers, the peak, the pinnacle and we were up until Sir Alex left. And we are certainly not a successful club at the moment - our players won't have sell on value until we start being successful again.
The reality is we're going to have to buy our way out of this hole somewhat - but we have to buy well and that's going to be a balance of finding gems and nurturing them around ETH project but also buying value for money now to provide success (Casemiro/FDJ etc).