If you are happy with slow growth then yes, it is a very safe investment and will rise this year. However, do not expect massive growth as it has already been to the moon. You should invest in cheaper coins that will reach the same price as ethereum. Take a look at LISK and NEO, both of which are competitors to ethereum and will rise rapidly this year. LISK is cheaper, but NEO is already ready with ICOs - both are better investments for 2018