I think they just believe in only traditional old ways to make money and also a reason most millionaires unaware about latest technology they work done from their employees,Also they might not just like the thought of decentralized cash; they have been in a trade for so long, they circulate people's speculations for profit. Imagine individuals really owning their cash and not the banks  that's a tremendous danger to them.But finally at all the winners of futre are those who know about Bitcoin and know how to handle crypto market.