Ah yes, the soaring  $10,000 per Bitcoin in 2015.  Let's see what this means. 

If miners decide to sell all their mined Bitcoins, (or 50%), this is how much daily fresh money is needed on the exchanges for the price to be stable:

2015-2016 :   $36 million ($18 million daily if 50% sold) 
2017-2020:   $18 million ($9 million daily)                         
2021-2024:   $9 million ($5 million daily)
etc.

Don't forget that they have to sell to cover their electricity costs. So, if Bitcoin is $10,000, good luck in finding that daily thirty million dollars.