Soon in Cura time, could still take a while.
I've been using the solution posted above and am very impressed with it over the last month. I've been able to make some really strong / flexible frames that are very well laminated together with minimal surface finish problems in PETG using the version above.
I hope that whatever the final solution is, that they use terminology which overlaps with the terminology of adaptive layer height. I think Adaptive Line Width is a very easy to visualize thing, even if the inputs are a little bit different because of how they choose to allow the slicer to pick the variations.
Ultimately, I'd love it if I could tell the slicer a desired line width, a minimum line width, and a maximum line width. (It would be nice if I could just tell the slicer my nozzle size and then I could tell it that I want line widths that are anywhere from 80% to 150% of my nozzle width with a desired line width.) The idea is that the slicer ought to be able to pick a line width that decreases the gaps and improves the number of lines / lay of the lines on any given layer. There would be room for advanced options that try to maintain an overall outer wall (or specified number of walls) line width that is uniform as you move through z layers. Say for example you want 2 outer walls to have uniform line width on the outer shell, but any other walls can be varied up or down to the best fit within limits.