People mightn't accept Bitcoin instantly because they're used to using fiats all their lifes but as the adoption goes on, people will used Bitcoin. Bitcoin can't shrink the economy but it'll improve it. Everybody owning Bitcoin will make them to have a different thinking about money and will become more functional to the society, be financially informed and not just a liability. Having Bitcoin makes you an investors and that's how people will begin to reason and it affects other things in life. I don't see anyhow having the thinking of an investor is going to shrink the economy. I'll improve it as people begin to invest in businesses and start up theirs  making more job available for people to work, add value to the economy and everybody is happy. With more job creation, the economy will be the one benefiting the most of ias money keeps circulating in and out.