Yes, due to the nature of a ponzi, some people will profit,
Far from certain (unless you meant the operator). This ponzi locks the funds for 120 days. Will there be enough inflow after that time for the ponzi operator to make it profitable to pay out those accounts? Absolutely not certain.
BT lasted for quite a bit longer than 120 days, so I'm fairly certain that there are some that managed to cash out their initial money and profits.
Also, the 120 day lockin was one of the smart tricks that contributed to the success of this particular scam. Almost all Ponzis allow you to withdraw your money at any time. The 120 day lockin has 2 advantages over that: First, it makes the story more believable, because if your money was truly invested somewhere, it wouldn't be available for immediate withdrawal. Second, and more importantly, the lockin period prevented panic withdrawals. With other schemes you see people trying to mass withdraw when the site is down for a few hours or when there are other issues. With BT that was not possible and the operator could anticipate potential large withdrawals long in advance and this, I think, contributed greatly to the stability and longevity of this particular Ponzi.