If simple and lazy people abandon Bitcoin because they get ripped off (as a result of said deficiencies) I say goodbye and good riddance. In a lot of ways such people are useless baggage which limits the potential of the solution. I may feel that way in part because I personally have no plans to try to exploit them though.
Here here - currencies are so much more useful when fewer people use them. 
If by 'useful' one means 'stable', I would certainly say that Bitcoin is.
I've got no use for a currency which is going to be ripped apart and subverted due to some nebulous and wistful hopes of destroying the most powerful entities that the earth has ever know (our current banking institutions) and/or being able to cheating on one's taxes.