That Joe Public runs away out of fear the safety of his money can't be guaranteed
Whoooooosh. Bitcoin allows you to become your own bank. If you cannot trust yourself, then you have no chance.
AFAIK, no one has ever had a break and enter on their premises and stolen a paper wallet
That other, better digital currencies come along, relegating Bitcoin to the sidelines
See above point.
That big banks themselves co-opt the still-relevant technological developments embedded in Bitcoin and junk all the bad parts"
See first point. And please tell me the bad parts?
What's the point of Bitcoin now?"
I don't have to trust the looters and leeches with my money.
While you are at mister banker, ask all those traders who funds got stolen in the great MF Global heist how safe their money was.
The funds were meant to be in segregated accounts and you allowed him to steal them.