It is definitely worth to invest on Ethereum and some others coins currently on the top 5. Imagine the price when overall cryptocurrency marketcap reach a new heights within a year or two.
The price of ethereum looks good as of this moment now and even if we encountered sudden drops as it fluctuated from previous weeks, but we should't have to be discourage so it's worth investing now. Long term can be a food way to invest for it and from previous experiences I had was such rewarding by the time price surged higher, and you sell your holdings.