Blee, the reason I disagree is that right now, prices are held up because there's only one chipset, Sony's proprietary SRXD/LCOS one, that is available for 4k. Once TI releases a 4k consumer DLP chip, I think manufacturers will be falling all over each other, as they will need to do SOMETHING to continue projector sales, which, to my understanding, are flat and probably flattening more. Unless the 4k chip is more expensive than I expect, I think you will be able to combine that with something like the Fujinon lens in the Epson 5030 and what should be off-the-shelf video processing by then, and slip in around the $3k price mark. Maybe the linchpin that determines if prices will go down is if Epson can create a comparable chipset, and drive competition.
Also, I find Integrated_AV's comparisons with the 1080p timeline compelling.
Prognostication is always a dangerous art, and I wouldn't place too much stock in anyone's predictions, including mine, so I may be sitting down to a tasty helping of crow in 3 years. But, if the worst thing that happens to me is that I was watching an Optoma HD25e instead of a refurbished Epson 5020 for that time period, then, as they say, First World Problems!
(BTW, just to clarify, my "prediction" is "around" 3k street price with models released around CEDIA in Fall 2016, so 3 CEDIAs from now.)