By the 2nd half, samsung might have fixed its 3bit 32nm chip problems. That is the major development that will bring prices down.
I'm not aware of any flash producer intending to put 3x MLC flash into consumer SSDs. The cells are simply not robust enough (by orders of magnitude) to handle the read/writes.
Traditional 2x MLC sports >10,000 read/write endurance whereas
at best the plans are to make 3x MLC parts capable of delivering 1,000 read/write endurance.
The things you have to do to the 3x MLC device (design, layout, materials, etc) to increase the endurance all involve making the chips larger in area, so much so that by the time you get a 3x MLC chip with 10,000 endurance the bits/mm^2 are comparable to that of a 2x MLC chip anyways so you may as well have just made more smaller 2x MLC chips instead. (the same is true if you want SLC endurance out of an MLC device, you have to make the cells so much larger that in the end you saved nothing by making it an MLC device to begin with)
There is no free lunch, multi-level cell technology is a cost-savings strategy that intrinsically relies on being able to trade-off write endurance (and speed) for increasing bit density.