What Jack Ma said is just his personal opinion and we should not demotivated from his speech. Bitcoin will live long and one day everyone accept bitcoin. As block chain technology rises, bitcoin will also shine.
I fully agree with your opinion, that bitcoin is the future and will be accepted by everyone. This is what I always wanted as a bitcoin and altcoin investor, I wanted to see it paid for in medicine, and many other things like the store next to my house.
Always be depending on how people will react and how they will keep the support even there's a big personalities that will be against the system, we knew that Jack Ma is one of influential person around the net we just need to keep our position, if you can keep your trust and keep supporting the chain then it will not affect anything since Jack Ma still far influencing investors.