I hear a lot of people talking about the need to shift decimal points, but never really understood -- what's the benefit of this over just using SI prefixes? To me, it's clear how 1mBTC relates to 1BTC and 1µBTC.
I think people underestimate consumers. Before Decimal Day (1971), 1 British pound was worth 20 shillings, and 1 shilling was 12 pence[1]. As confusing as it seems to me, apparently that worked for awhile. Likewise, I think consumers could deal with SI prefixes in a decimal system (rather than needing to redefine how much 1 BTC is).
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