Part of the root cause is violations of the gentleman's agreement to not trade testnet coins for money, this results in predictable chaos with people sniping the low difficulty blocks. Some believed that resetting alone would discourage the conduct, but even if it had (it hadn't people are selling them now) it was still likely that people would hoard up coins just in case they became tradable in the future.

There is a simple fix for this which doesn't result in an operating difference from Bitcoin, just an economic one.   Hard fork in an ultramassive premine, as large as possible but what stays with existing value overflow logic. (so maybe an additional 21 million testnet btc?).

This also resolves the 'actual developers can't get coins problem' and if someone starts trading tnbct for money, whomever has the premine wallet should feel feel to sell into it what they can.  Once they run out of coins it'll be time for another testnet reset.

It may just not be possible to prevent degens from trading tn coins for money, -- I mean consider the altcoins that some people spend money on ,  there is basically no low bar on how crappy you can make a cryptocurrency where some scammer won't try to sell it to some fool.  But what can't be prevented can at least be turned into a benefit.