Thomas, it is great to see you here. Steem may crash, the entire Steemit platform may be unsustainable, but take advantage of it while you can! Nothing wrong with that. Never turn down a chance to make free Bitcoin. My latest Steemit post can be found here: https://steemit.com/bitcoin/@bitcoinmeister/cryptocurrency-psychology-bitcoin-short-term-mindset-disease-and-irrational-feelings-about-the-other-ethereum-community
Dont see it crashing anytime soon. It is really far more protected from crashing than just about any crypto.
I'm keeping an eye on the incentives design as well as how Steem is doing on the exchange as indicators of long term health. I'm not liking the uber voting power whales have, nor do I think that 'getting in early' on the new post popularity contest is beneficial to the platform. Why not try rewarding voters much later, after a post shows some staying power and quality? Some better combinations need to get implemented ASAP.