Like any trading activity, the risk is to lose some or all of your money. This can happen if Bitcoin turns out to be only a speculative bubble, and eventually explodes.
Currently, there is no real consensus. According to the impression I have (and this is not based on any precise statistics), economists are mostly reserved and believe that the course of Bitcoin will collapse once the fashion is over. That said, some economists believe in Bitcoin.
The community of crypto-enthusiasts - who believe in cryptocurrency - is quite varied, but involves, it seems to me, more "hard" scientists (math, natural sciences, computer science, etc.) than economists. The most optimistic of them think that Bitcoin can climb up to $ 500,000.
My personal opinion now: I think that cryptocurrencies in general have a bright future ahead of them, and that we do not yet see their full potential (especially for the ether, in my opinion). That said, rather than trading, I would rather recommend buying and waiting for the price goes up, simply, without selling and buy daily following the course of the course. Many former crypto's favor this method, which has a similar profit and a lower risk.