In what regards top sail racing
I have seen an increase in top racing
American boats on the last years. True that contrary to European ones they are not normally owned by Sponsors but by millionaires but maybe that increases the interest in sailing since true top sailing racers provide spectacular video and TV images
and therefore they are broadcast because general public like spectacular images
Also the Caribbean
circuit has been increasing in number and quality of racing boats (many are Europeans that's true) and I believe that is also meaningful.
I made (sometime ago) a post on my blog about the increase in quality of this year's edition of the Caribbean
600. The images don't leave any doubts about that