I know some speculators reverted to fiat at the end of the year because of accounting/taxation uncertainties in previous years. If these uncertainties have been cleared up it might be less selling pressure towards the end of the month than I originally feared.
Or I could be talking out of my ass. Who knows?
I'm actually specifically waiting till 2016 before I do any fiat/btc exchanges, for tax purposes. I'd prefer not to do any trading at all, but if there's a move I might trade on margin.
... by 2040 the vast majority of bitcoins will have been 'mined' into existence.
The next 24 years are critical.