Let's be honest here and while I too love bitcoin and that's why I am here but below are the reasons I feel bitcoin still is behind banks in terms of ease :
1- Acceptance: Not everyone accepts bitcoins while everyone who accepts bitcoins surely accepts bank cards
2- Trust: Bitcoins being decentralized it always has been a pleasure but at the same time there is no guarantee, I mean the money in your bank is protected by your government while bitcoins you cannot say anything to anyone if tomorrow you hear bitcoin is 0. The area where I see bitcoins superior to bank is that bitcoins give you the control over your money while banks take control over your money.
If you come to my country right now your credit card is useless. The Trump administration ordered Visa and Mastercard out, they cannot process payments here. Even before that, there were many places where credit card were not accepted for various reasons.
Bitcoin's price is based on the market, that is the amount of people who find it useful overpower the ones that consider it not useful. The tendency not only has not regressed, it keeps increasing over time, albeit slower and slower as it should be for a coin that does not lose value because its production is limited in code and cannot be changed on a whim of a select few. Bitcoin is valuable because of the made its made, and because of its distinct features. The proof is the market price. It cannot go zero over night like you imply, because the market is backing it up. Any attempts of dumping it will find and equal and probably stronger force of pumping it.
If you still do not understand this, you do not understand the value of things. The value of things depends on the usefulness to both the seller and the buyer. It is useful to millions of people, this is why it has the value it has.
Things that go zero overnight are things that can be destroyed, like companies, governments of countries. There is nothing in particular you can do to destroy Bitcoin, short of destroying electricity generation and communications worldwide. It is easier to see the US dollar or the Euro disappear than Bitcoin. Even gold is weaker. Each Bitcoin (satoshi) is unique and its intangible, it can be exchanged across borders at the speed of light (confirmation takes minutes but thats another matter). Bitcoin is so useful the number of people wanting it is slightly increasing over the amount of coins that are and will ever be available, which is why its price keeps climbing. Well that, and the fact that all fiat coins have infinite production, which makes them lose value intentionally over time.
Once you understand this and the rest of the features that make Bitcoin secure and reliable, you get to understand while the demand keeps even after 11 years and counting.