I agree with you, in fact, Bitcoin is a currency of such a nature that the more you wait to invest, the more you will fall behind. Every moment is very important to start investing in Bitcoin, invest first if you have money, the more you think about the value, the more confused you will be, because the value is never constant. The time and opportunity that is lost once, never comes back later. So never delay in starting investment, delay means losing time and opportunity. A skilled investor knows the true nature of Bitcoin, that is why a real investor never delays in investing. Whenever he has money to invest, he invests, and they are never afraid of instability, because instability is an opportunity for them. Because they are very sure and optimistic about the future of Bitcoin.
If someone doesn't have a clue about what is bitcoin then forcing them to buy can be a bad idea, what if the price crashed once they bought and you are the one who they will blame you. So guiding them when they realize bitcoin is their path is good but when someone still haven't made up their mind can take their time. Better late than never cause if they do it for wrong reason and faced the loss they might exit the market and will never think about coming back.
So this isn't entirely about the price, it's actually the cause that should drive them to invest, a person who truly understand bitcoin will not be shaken by the volatility so the short bumps and dumps will not likely to alter their strategy if DCAing or whatever they want to practice.