Eventually, we'll have to buy them. Try finding a mtn.bike frame with v-brake mounts. Some companies don't even make any 26" mtn.bikes anymore! You have to buy a 29"er. In five years it's all going to be discs. I bet Ridley (king of Euro cross) has a disc bike next year and when Dura-Ace discs happen it's over for cantis.
Bump this thread in 2017 and we'll see how many manufacturers still have cantis mounts on their high end frames. I bet it's zero.
MTB is a different story. What happened for mtb will not in cyclocross for some simple reasons:
1) There are mtb specific groups since ever.
2) Disk brakes in mtb are a real need and they were very well welcomed by 99% of bikers (the market)
3) There is a huge difference between MTB and Cyclocross in terms of popularity, therefore the return of investment in developing disk brakes for mtb was guaranteed, that's not the case for cyclocross
Cyclocross components are inherited from road. Do you really think Shimano will develop an hydraulic DuraAce version for cyclocross ?
It would be a huge investment for a very very small market. I don't think Shimano guys are so stupid.
Even if 100% of cx riders all around the world would use disk brakes, it's still a very small market
If you have any doubt on this, please consider Shimano didn't even develop a serious cyclocross specific cantilever brake in all these years.....or... they didn't even put a DuraAce 46T chainring in their catalog etc. as just a few examples to understand how much Shimano is interested in the Cyclocross market.
You will never see an hydraulic version of DuraAce for cyclocross, unless they will do it for the road bikes....but probably this will not happen in the next 300 years
Last but not least, don't forget shifters are integrated with brakes, this leaves no chances to after-market products that could be developed by companies that have been doing good things for CX in terms of brake systems, like TRP etc.