I think this kind of talk is ridiculous. You want to switch to mBTC just so the perception of value changes to the point that the public will be ok with buying again? The client will switch to BTC/mBTC/uBTC for personal convenience, not to fool people into a perception of lower valued units.
Perception matters. I've been telling some people I know about bitcoin, and the $800/unit price holds them back mentally. They are reluctant to buy, not because they don't like the idea of the technology or think it has potential, but
only because of the high price per unit. They compare it in their minds to the prices of stocks they buy. Nobody wants to buy a fractional share of something. The average small investor might be happy to buy 250 mBTC of bitcoin, but would not bother to buy 0.25 BTC because it feels like a ridiculously small and meaningless amount.