Yes, with the return of interest in vinyl and tubes. K-horns, design now over fifty years old, are strong players if you have the space. You need a room that is at least 18 feet across and 30 feet deep to do them justice. If you add a Belle center channel you have the best of all worlds, in that the imaging cannot be beat. Tubes take the edge off the horn sound. I have had the K's and drove them with triode 15 watts and solid state all class A 30 watt. Tubes sounded better.
Are horns and hi-eff designs becoming more popular
I feel they are but wonder what others think? Since today one can build hi-eff designs in most any type of loudspeaker. With many new hi-eff transducers availible. Hi-effs not just front or back horn designs anymore.