That's a partial answer to only one question which, if a quick google search is correct, ignores all but the easiest problem: BIP38 appears to offer a way to backup a primary key using a printout and a memorized passphrase. That doesn't answer what happens if they lose one of those two things, much less what happens if someone malicious gets either the primary or the backup.

Remember that I didn't say your favorite toy sucks, only that not everyone else has your level of appreciation for it. Most people aren't going to put serious amounts of money into something which they don't trust and the status quo works fairly well for the average person: increasingly few people carry significant amounts of cash, most people use bank accounts and credit cards, etc. which means that the maximum cost is usually either capped or otherwise (e.g. you lose your ATM card but the recovery cost is only the time it takes to go to the bank with photo ID).

Bitcoin can do interesting things but getting non-aficionados to use it will depend on getting to a comparable degree of confidence, especially since most people don't share the [over-]confidence that the typical Bitcoin advocate has regarding their personal info-sec footing.