i think we will not see that,
because if that thing happen,how much it will be for every transactions ?
at best we should see it at least around millibit(mBTC),
in the next few years later,we should see people calling it dBTC(deci-bitcoin),
and then cBTC(centi-Bitcoin) and lastly mBTC(milli-Bitcoin).
we will not see anthing below i think.

im talkin normal people. What u talk bout is nerd talk.  U need to have somethin mass adaptable. But then again, bitcoin might be the virtual gold so it will never be a mass payment system.

If Bitcoin price keeps going parabolic, it won't be long.

My friends and I don't usually use the term bitcoin when we're talking about transactions. We refer to it as satoshi since satoshi now means a lot and even satoshi would count and cost a lot too. So, maybe in the future the people would use the term bitcoin often.

It is just a unit measure in bitcoin price hierarchy so don't be confuse yourself in that. For unit level you can go with the below units measures.

Unit   Abbreviation   Decimal (BTC)
Algorithmic Max      20,999,999.9769
megaBitcoin   MBTC   1,000,000
kiloBitcoin   kBTC   1,000
Original Block Reward      50
Current Block Reward      25
decaBitcoin   daBTC   10
Bitcoin   BTC   1
deciBitcoin   dBTC   0.1
centiBitcoin   cBTC   0.01
milliBitcoin   mBTC   0.001
microBitcoin   uBTC   0.000001
Finney      0.0000001
Satoshi      0.00000001

Courtesy: http://bitcoinchaser.com

It is actually measures in the form of decimals all the time very few says in mu btc or satoshi.

When one Satoshi is equal to one dollar it will probably be common place to speak in Satoshis, until then there will probably be a lot of half, quarter, or tenth of Bitcoin type talk.

When 1 satoshi = 1 dollar, it'll mean that the bitcoin is worth 100 million dollars. Unless dollar lose most of its actual value, there won't be enough money in the word to buy 22 millions BTC at that price.
If bitcoin is used more widely as a money then we'll talk of bitcoin cents (0.01) as a lot of currencies have their cents.

I'm thinking about this and we used to use the term of bitcoin into point zero zero zero bitcoin. And it's now a norm that we call bitcoin as it is but I don't think we will be on that day that everyone will be used to the term of using satoshi's and look on the next term of mbtc (millibitcoin) as it is not even that popular term for bitcoin and also the ubtc (bits) so I doubt it that there will be the day that we will be on that stage of calling, this shirt costs quarter of bitcoin but still point zero zero zero is still at use.

A satoshi is, what, 1.0*10^-8 of a Bitcoin? That gives you can answer as to what kind of value you're going to have to have in order for Bitcoin to be measured in satoshis. Now keep in mind, that's a dollar value for satoshis, so there could be some variance if you're saying that something like "100 satoshis" then you'd be looking at $1m/piece, if you want something smaller than that then $10m/piece and 1sat:1$ would mean $100m/piece. That would definitely be an interesting time though, I don't know if something like that is necessarily considerable but you never know.