for me the real passive income is saving your money, you save your money now, you can save $100-$500/month then use your saving for passive income in your day of retirement 
The time when you get into your retirement day, the value of your money will be 10 % less atleast. Assuming that the inflation rate is on average of 5 % per year and if you save for 25 years until your retirement day then you could be able to do the calculation of your own on how less valuable your money will be at that time so saving is definitely not your best bet to retire
so should i save my money at bitcoin..? for long time..?, Im trust bitcoin can survive but no body can give you guarantee bitcoin price will be stable at high price (arround $1000). I think save your money for a day or retirement Is best option, we know inflation rate per year is very high but I will save my money in fiat for support my goverment.
and NO body know maybe in future my fiat money can goes up to +200%
We all know bitcoin has potencial,but in the same hand we know it can die atleast all should know it can loose value till it be called and stay dead.The thing is withing 25 years saving without moove those money you will double or get a huge interest even with the inflation taking a part of it.Bitcoin should be handled as short and medium investment,taking the much profit as you can ,because its huge potencial can become a huge nightmare.
And ETH is already going down, so we might see the price go back up a bit still.
Well yes bitcoin is still the major crypto currency.
The rise of ETH is good, but we all know there is a pump going on causing this. Right now Bitcoin is still the number 1 coin to invest in.