People feel comfortable to use bitcoin when it was totaly legal in all country and when we use it in all types of payment.
Also if the price is always stay strong i think people continue to invest in bitcoin and to use it as payment in different transactions.
Yes, it will be very comfortable to use when it is legalized all over the world and totally considering the fact that it is a decentralized digital currency without a central bank or single administrator. It can be comfortable also if bitcoin has no more scam and it will spread to the people its benefit to everyone who invest and how it will help to our economy and to those who are not employed. The more who trust bitcoin, the more it will be good to continue involving BTC.