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You are trying to pin down a moving target and give a permanent symbol to a temporary slang name. It seems rather silly.
Sure, right now some people (including yourself) have decided that micro-bitcoins (aka "bits") "will be the basic denomination coded into many systems, with satoshi 'cents'", but this is only because that makes sense for the current scale. If a few years from now (or 5, or ten years from now), the value of bitcoins grows to the point where you can buy what today would be thought of as a $300,000 house for 3 "bits", then the scale will have moved and nobody will be see "bits" as "fundamental, in that it will likely be the predominant usage down the line". They'll simply move to a new slang name for a new scale.
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Danny, you say below that you like using Mikes, micro etc.
So what will be your slang for when 3 bits=$300,000 (your own example)? Will you just continue on to nano/pico...
Actually, a nano-bit doesn't sound half bad, perhaps we should just jump right to that?
Also, I can tell that your name is not Mike!