One, the masses including your mom and dad will never use a system that if they lost some long string of numbers and letters lose their entire nest egg, they simply won't. People need their bank to offer insurance, which in theory is perfectly possible if A bank that holds people's Bitcoin proves the risks are low due to due diligence.
Actually, they use a system requiring keeping a small piece of information secret and accessible exactly because it enables them to -not- lose their nest egg. If there were another way we wouldn't bother. If your parents prefer to hire a money manager, I recommend: you. If they don't trust you, one good way to see if the people offering them services are honest is to see if they avoid the word "insurance".
Two, people need some human trust and interaction so money can be tangible for them, even a website with a helpline does this. They need a physical address of a company, a CEO name and staff, financial regulation and accountability. Otherwise they will think shit they could just walk off with my money, this stuff is a must.
As you pointed out in point 1, bitcoin is already too tangible for your parents. If a "website" (what's that by the way?) makes people feel comfortable giving their money away, they need to lose some of it to learn a lesson. Thinking that money managers might walk off with what you give them is also known as common sense. We -should- think that, and therefore be careful to use people we know and trust and proper incentives.
Three, People have been brainwashed to understand fiat, they want to pay for stuff in dollars, pounds and cents etc. not pay 0.00003 BTC for a T-shirt.
3000 sat for t-shirt is damn cheap! Anyway, people have been brainwashed to accept all kinds of total nonsense [snip list]. Do you suggest we cater to the idiots? I don't see why idiocy should be rewarded.
I am surprised so many people here can't accept a simple concept. Maybe if I describe what I'm suggesting as a coop bank or farmers bank it will be understood. Simply pooling wealth to gain community benefit to hold and lend money isn't exactly a radical proposition. The mainstream banks would by the way be terrified if someone started such a service as it starts to undermine their business, am I being attacked by CIA or Treasury agents on here?
As I see it your suggestion is neither radical nor new. See e.g. mybitcoin.com which was the first bitcoin bank I heard of. Now there are a lot like xapo, mpex, btc-e, to pick three services randomly which hold funds on your behalf.