Only somewhat. New deliveries (and the last of the 763 conversions) are 2-cabin only right now and there has been no commitment to future 3-cabin products made in any official capacity. They're not ripping it out like LH is, but they're definitely not growing the number of seats available.

And it is, IMO, niche in that only certain markets can support it. That may have always been true but the airlines are finally doing something about it. There's also the problem of Business Class being too good so that it rarely is worth the premium to move up to F. Lufthansa execs went on record lamenting the flat-bed C/J seat as destroying their F yields.