BCC seems very sustainable and stable as such. I think the only 2 reasons that it can collapse is either some kind of gov-t decision to shut them down or owners telling themselves "OK, I think I've got enough money now and can quit business...". And the 3rd reason being BTC collapse of course 
===================================================================================================================================How can government shut down a decentralized system? they can forbid and make its citizens responsible to withdraw investing in crypto-currencies, they did that in China and everyone continued trading in HongKong. Governments can't even stop their people from taking opioid what makes you think people will give up their wallets? or Wall Street can close a decentralized system? it may take 5 years for real changes to happen and those may come from IMF agreements.
That's good news. I understand it. I am not saying this is possible or impossible, just stating the reasons for the system to go down. Leaves us with only 2 remaining reasons?
As far as I can see that it cannot be take down since its decentralized and a lot of people is supporting the Bitconnect. I can say that they have an excellent strategy with Staking, Mining, Trading exchange and Lending.
Not all cryptocurrency has this kind of platform. People are just saying they are PONZI, I would say yes but thats how the business work.