I believe that bitcoin is very good for long-term storage, because doing nothing after a few years can become a millionaire. It is very convenient for schoolchildren.
Wow your dream was so high, even how long you hold your bitcoin it was not earn income so how can you be a millionaire? In contrary on what you said I can't believe that you can earn benefits on long-term savings on bitcoin. Because of the following reasons;
1. Bitcoin was not generate interest on wallet every months or years.
2. Fluctuation of bitcoin on the market was unpredictable so no assurance of income.
3. There's a lot of coins or altcoins in the market so how can you manage the competition day to day.
There's a lot of benefits in bitcoin but long-term savings, I can't believe that maybe daily deposit on wallet to increase your savings.