Spurs are a cautionary tale in the fact they are one of the super income clubs, that money is supposed to ensure they always have the players and manager to keep teams like Brentford/Bournemouth and the 3 promoted sides etc. at arms length.
Effectively what we are trying to reproduce with our new stadium. If Spurs can go down or even nearly, then we need to be very careful who we employ after Moyes. If we were to be picked apart for our better players and don't replace with the right character, we could easily find ourselves back in it.
I suppose we can always hope the promoted teams revert back to type and struggle to make mid-20 points, which makes this event rare. To me this is why it would be the biggest shock (in relegation terms) should Spurs not survive.