What is the best bitcoin business to create that will grow throughout 2017?
I think that it is better for those huge companies that are already on the market to add the bitcoin payment method to their website and allow their clients/users to make payment with bitcoins.
it's always be the first goal , make bitcoin accepted in a lot of merchants especially a huge companies like ebay and amazon maybe? once they accept bitcoin i believe there would be a big impact. but while waiting that's happen , you can always create a business that most peopple looking for. you can create an alternative market as a replacement of what people want on ebay etc.