How is that relevant to the discussion, though? We are one of those historically big clubs not to mention being one of the ten richest clubs in the world.
So the relevant question is whether or not any of the other clubs in that bracket would accept the same manager failing consistently to challenge for, or win, the league for the same reasons over a ten year period without replacing him.
And I think the answer to that is a very clear 'no'.
Which is very different from your original point and discounts the fact that Spurs are, arguably, currently doing exactly that with a turnover substantially lower than ours.
Once you bring resources into the argument you have to face the question of whether we are making the best of ours, regardless of whether that challenges the financially doped or historically bigger. Its tough to argue that we are.