I disagree with you, not only investor that accumulate using the DCA method will be successful in the future rather any method or stretagy one use to invest in Bitcoin and been carried out well then that investor will be successful in the future so not only DCA investors will be successful in the future. It is possible for someone to hold for long term and still not have a good return so it's not just about holding for long term rather it is about accumulating regularly that is growing your portfolio because the bigger your portfolio gets the more profitable one will be in the future.
Yes I totally agree with your sentiment here, because the goal is to accumulate a huge stash of Bitcoin and hold for the future, so the most important thing is not the system used to accumulate but the consistency in accumulating and the size of their stash. The DCA accumulating strategy can be utilized by anyone but it is well structured for the average and low income earner that thought that they can't invest in Bitcoin, so the DCA method makes it possible to accumulate regardless of your financial status, but the real goal is to buy as much as possible and hold for the future.