Probably because they won't make money on HFR because every TV already supports it, even grampa's 200 pound boob tube.
The laser one is 3000 lumens and goes for 2500$. So, compared to the UHD60, you give up 4K and HDR for laser backlight. Basically long bulb lifespan, probably quieter, and faster dynamic adjustments and maybe even fade to full black (although that doesn't matter in practice all that much, and I say this as a sci-fi movie buff).
I guess you can make an argument for a lower TCO for the laser unit, but considering it's already obsoletem no WCG, no HDR, no 120hz (2017 and it's not even UHD compatible in any way? uhh, that's a stretch).
They could have made the sale a much more competitive choice by offering us 120hz 1080p or even 60hz frame packed mode for NVidia 3D, and possibly even WCG + HDR10.
It's going to be a very tough sell for just the lasers when the UHD60 is basically the same price. Sure, you get to buy lamps instead of never losing any brightness thanks to lasers, but seriously, I really wonder how that makes any sense. At least give gamers a reason to buy it, like 120hz and HDR. 3000 lumens HDR on a DLP should look almost as good whether it's at 4K or 1080p.