Yes bitcoin is good for long term investment. To store the value or higher value than today's bitcoin value. I do believed that bitcoin is not for short term investment but it is for long term investment. The more you earn bitcoin the more chance of having good earnings when time comes.
Yes as we see on it bitcoin grows every year. It will be a long term investment and it will surely help many people. Bitcoin can be both short and long term depends on the wants of investor. Way back then year 2009, the bitcoin price was too far from it now, even investors before didnt think that bitcoin can reach it. Thats one proof that bitcoin can be a long term investment.