4) The 5th grader problem - Let's face it, Joe 6 pack can't do basic math, he is not smarter than a 5th grader, even less so in 3rd world countries where education is seriously lacking. DON'T fractionalize the coins into ridiculous numbers of decimal places, or make people use 8 different fractional acronyms mBTC, satoshi's etc. The major problem with bitcoin from gaining mass adoption is that it is seriously not adhering to the KISS (keep it simple stupid) principle. You think in 10 years, your average person is really going to understand or want to deal with .000004 bitcoins? Please consider the Brazilian solution. Brazil in the past few decades had severe bouts of high inflation in their "Real" currency... after the inflation got too high, i.e. the number of ZEROs on the notes got too be too many they simply issued a new currency and said something like 1,000 of the old Real's are now worth 1 of the new issued Real's. This didn't solve the high inflation issues of course, but it's a simple solution that could solve trying to deal with .24056794 bitcoins to buy a loaf of bread.
Good idea but the alternative was "people are earning 10000000 satoshis a day (vs 0.100000000 btc)", do they really think we'll use a currency that is THAT UNFAIR to early adopters?"
the decimal point sort of hide that fact!