While I agree that Threadripper will be priced competitively, remember that it's rumored to be clocked much higher than EPYC. The $849 rumor price that B&C is probably pretty close to reality. I'm expecting something closer to $999.
An isn't $850 the rumored price? Was there any other noteworthy rumor that put the top 16c/18t part at $600-700?!
EPYC CPUs may be clocked lower, but they also have more dies & connectivity which takes up room in the TDP budget. They're all clocked for efficiency too, which means low core count SKUs may be more conservative with clocks than needed: if you compare 1P SKUs you may notice the 16c and 24c SKUs will have very similar Turbo clocks, which can only happen if the 16C unit still has some headroom left until maxing TDP.
If we look at EPYC launch price indicators, TR 16c kinda needs to cost more than $700 (price limit for EPYC 16c) and less than $1100 (price limit for EPYC 24c), which marks both $800 and $1000 on the price map for possible SKUs.