Yeah, investing in btc is about long run but still should be about "Invest What You Can Afford to Lose". We live in a pretty risky world and still selling a home to get money for investments is pretty bad idea as for me
I think that some of them still have chance to pump in case of new bull market. But only the biggest ones or from exchanges that somehow unique from others
51% attack is no longer the main risk. After blackrock etf approve they will have incredible amount of btc and all their fiat to manipilate the industry.