There is no point! You can trade less than a full BTC right now, so who cares? I think it's a stupid idea to change the way we look at Bitcoin for the sake of small holders.
i disagree.
mbtc is vital for the future of bitcoin. for the average guy bitcoin is a very abstract concept to begin with. but we need the average guy if we want mass adoption. it is already hard for a beginner to put "real" money into this abstract currency. but is is completely impossible to get anyone to invest
into just a fraction of something this abstract.
i know it is not rational. it´s a psychological barrier. if our average dude comes home to tell his wife he jumped the fence and finally bought ... oh well 0.0034456 of what ever he will feel reluctant. if he could tell he bought a couple of hundred it will be a much easier thing to tell.
in my opinion milli-bitcoin is a question of survival. the community needs to adopt this, so mass adoption can take place.