is it in a desirable state?: You can't have a desirable economy when the game itself is stagnant.
if not, what could save the economy?: Saving the game would be a good start.
would you rather have everyone in the community running around with at least 10,000 tc?: They would ultimately end up losing it in bets / duels unless they are good at the game, that's why average / bad players are poor while the good players can easily get millions of TC.
SHOULD art be as expensive as it is? should textures be as expensive as they are right now?: Art prices are a natural occurrence, there's no system in place that dictates what art is valued at other than what people are willing to pay for it.
SHOULD staff bring back 5000 tc tournaments but raise the prize money? would that do good for the economy?: Staff need to do many things, but they have been busy hiring femboys in furry suits for the last couple of years and now we see most players have been perma banned for nonsense. Wonder why nobody plays anymore hmmm....maybe becuase they got banned for 'harrassment / transphobia' or some other progressive woke bullshit nobody cares about except the ones in positions of power. just my opinion tho.