I don't think attracting late adopters will be an issue. If Bitcoin survives it's early growth/volatility phase, the late adopters (who by definition are always late to the party) will get over the "it's new/scary/phony/scam" and start thinking "it's normal".
My point is that there should not be a party and there should not be late or early for this to be adopted by ordinary merchants.
I don't think "should/shouldn't" is relevant in a free market. Whatever is (outside of manipulation/intervention) is what is. The market [miners/investors/adopters] define what "should" be.
Any other way of looking at this leads to the possibility of legal tender laws where you force people to accept something they don't want. That is directly opposite of free market. The thinking and force behind those laws are proximately behind the situation leading us to be interested in bitcoins as an alternative to their fiat currency!