Now that's a daring and divisive opinion! So controversial. So brave.
Probably not slowed at all, given the prevalence of fusion and multicultural foods that have become more commonplace even just in the last two decades.
Or a better way to say it: I agree that necessity may indeed have been the mother of invention when it came to preservation in centuries past, and innovation due to preserving food is mostly unheard of now. But I'm certain that globalization (for all of its many flaws, which we deffo can't get into on this thread ) has more than made up for that difference. People have more access than ever before to a wealth of ingredients and cuisine (which they immediately incorporate into their own cuisine). Food & cooking media is also huge, and it inspires many to push their culinary boundaries.
As anyone who's ever tried to google a recipe ever can tell you, we almost have too much culinary innovation these days