These things move in cycles.
4-4-2 was the standard, but I'd argue the best teams in Europe mostly play 4-5-1 now. They switched to 4-5-1 as a means of dealing with a 4-4-2 formation. Now we're moving towards more 3-5-2 formations as a way of dealing with a 4-5-1.
I'm confident you're right and we'll see 3-5-2 becoming more of a standard over the next few years.