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The ease of using the DCA method must be accompanied by confidence, because this confidence will ensure everything runs smoothly without being affected by anything, because we are confident that no matter what happens, it will not prevent Bitcoin from continuing to rise in the long term.
Every investment comes with risk and the same applies for bitcoin too and you can never say I am 100% sure that bitcoin will be higher in the next 5 years from the current price and it will likely to be but my point is there's always risk factor in it which creates pressure for retail investors.
It was in the past that people were saying they aren't sure if bitcoin will increase in price in X number of years. But in today's world that bitcoin has come into mainstream, we shouldn't be saying that again. If people that are investing in gold, stocks and bonds are confident that their investments in those things can will give them profits X years from when the investment was made, why can't bitcoin investors have such confidence that bitcoin price will increase from it current price in five years time?
lack of confidence in bitcoin will generally affect you as an investor, it will give you the mentality of investing for the sake of quick returns and once you see bitcoin in the slightest profit, the next thing you will thin of doing will be to sell off your bitcoin ASAP. look at real estate people for instance, they literally go about telling people why investing in real estate is the big deal and will use any known means to convince people into getting involved in it. even with the uncertainty that is also involved in that asset class, they are still very much bullish about it, how much more bitcoin that is becoming the happening thing globally?
as long as investing in any asset class is concern, there is none of them that is completely void of risk, as a matter of fact, bitcoin is even one of the least risky because as long as you are not in an haste to sell, there is no way you are going to experience any form of loss. you only loose when you are fearful and you sell too soon. five years might seems too long to hold your coin untill you take it a week at a time and discover that it is not that long afterall, with that, it becomes easier to hold your bitcoin for as long as you want to.