There is always a sacrifice that must be made when doing something, especially what we are doing here is for our more secure future. I think it is something that is worth sacrificing when we leave the fun for today by diverting it to invest and do DCA every week.
What I feel when we are already happy and used to doing this is thinking how to continue doing DCA and increase the amount, one of the things I am doing now is looking for extra money, and I do anything as long as it does not harm others and the money I get from the right way.
I hope you are not suggesting people sacrifice basic needs such as food, healthcare and others, so as to invest in Bitcoin? We are talking about long term investment in this thread and there is no way one can be sick and expect to hold Bitcoin for years... what happens when the person dies? They might sell the Bitcoin and use the funds for the funeral.
Honestly, investment in Bitcoin must be well planned and systematic if it must be sustainable. One of the reason I think the DCA method was developed is to make the investment process very easy and convenient. The aspect of setting aside emergency funds, that @JayJuanGee spent time explaining, is to further ensure there is no unforeseen event that will make one tamper with his investment unplanned. This shows how important it is to only consider investing when basic needs have been met.