Well, seeing as so many applications remain single-threaded despite years of mainstream multi-core CPUs, that shouldn't be too hard. Especially with many mentors in our industry cautioning new programmers that "concurrency is hard" so often that—at least within my small social network—new developers have been conditioned to avoid subjects like threading.

Yes, concurrency is a challenge, but it's tremendously rewarding. Plus modern languages make it much easier than it was in the past.