I don't expect too much of a change with the system, except for the scrips allowing new people to catch up to top level crafting easier. Yes you will be able to specialize and just do one craft enough to make your own gear, but the omnicrafters will still dominate the markets because they have the means to. The closest thing you could come to eliminating that is to take away crafting levels and gear, and make it so everyone has the same odds to HQ/NQ/fail any synth.

If there are specialist recipes, I don't see them being so numerous or fast selling as to warrant using an alt.