Perhaps the best path for many people is actually not to retire early, keep enjoying your job while you're young, AND because you have your Bitcoin as your fall-back, not worry too much about your retirement. What will a person do if he/she retires early? He/she will just sell and spend every Satoshi he/she has worked hard to save.
I read a funny story that most people who retire early find it very boring that they want to go back to work. They missed their job and corporate life and they are going back to work. What will a young and vibrant man be doing after retirement? Maybe going on vacation, fishing, reading, watching movies or reading newspapers. There is no reason to retire early except there are maybe health issues or other conditions that could lead to forced retirement.
As Wind_FURY said, let us keep enjoying jobs and contributing to the growth of our nation's economy until we reach retirement age. But we should make plans that will make us financially stable after retirement. Using the DCA strategy to keep saving Bitcoin for our retirement is not a bad idea. Before we retire we might be surprised by the amount of Bitcoin we might have accumulated using DCA. My focus is not to rely on just my gratuity or pension to survive, this is why keeping Bitcoin will be a good option to save for retirement.
However, thank you Greyhats for your analysis and advice.
I quite agree with you guys I mean retirement is fun but what happens next I think is boring especially if you don't have friends that have the same vision as you.
Tho for now It would be better if we keep stacking up our Bitcoin and holding it so when we retire we can sell. Our prepare like @Fiatless said at least return from our investment can cover up our monthly fee and that would be totally fine.
