You don't have to pity those who are not interested in bitcoin. It's not must that everyone must have a holding on bitcoin. Everyone should go with what they are comfortable with. Those who will feel regret will do it, but that's on them and only if they don't get enough from where they channel their investment, but so long as the person see Bitcoin only for profit from the angel you are referencing then there are chances some will never regret it.
Bitcoin is not something you most invest on, if you dont have interest to invest in bitcoin, know one will force you to invest definitely because when youre losing opportunity, others are getting, he wont affect them, because they used there time wisely and do the needful.
It's obviously not a must to invest in bitcoin but if the future is of topmost important it then becomes a necessity to invest. Not everyone has the knowledge about bitcoin investment and it's benefits. There are people who are lazy to learn new things or technology. For me if it's safe to encourage this ones there shouldn't be any need to hesitate.
Bitcoin as be in life for years now, and the future as continue to bright with Bitcoin for does that are investing in it, so we shouldnt be worried about others that dont have the impact to learn and get the experience to make them understand it and enjoy the benefits. Bitcoin will always be good in future, because the market is increasing day by day, new users are buying and hold, and some are trading with it, and all are getting profit on it, so I dont think Bitcoin can stop existing.
I stand to be corrected but I feel the larger the number of usage the more value it gets in the future. It's agreed bitcoin has thorns of users but other than scaring new ones away we can equally encourage and sustain their trust for bitcoin while they slowly learn and earn.