I will say that some % of your saving should be invested in bitcoin which will help you to retire a rich life as price of btc is rising and tends to rise in future as well.
It is not a written rule that you will be rich if you are investing in bitcoin.The price has already peeked and i do hope that the price could rally from this situation but the risk of investing at this time is much higher than people who have invested in it in the beginning.
Saving bitcoins for a long time have a major benefit. Suppose in 2010 the bitcoin price was $1 and now its $1040 so the investment has paid 1000 times and in only 7 years, where can you find a better investment than this??
It is true that you wont be able to find this kind of returns in any investment and people who took the opportunity made a good fortune.