IMPORTANT: Ixalan Cards and Events - Balancing and Thoughts

Szamsziel said:

Kld and amk sets rotate together after spaghetti. 

BUT that assumes that this game will follow the paper releases and rotation. There's a fair argument to be made for rotating Kaladesh early as it was the first set to try to scale back the power creep from Innistrad, but is still more powerful than the sets we're getting now. I did ask in the Feb Q&A if they'll be following this rotation schedule, so hopefully they choose to answer that question.

I get your point, you're probably right, i must admit i didnt take such a close look at it.
That would also mean that both kld and amk sets will remain in standard PQ for about a year,  that might be much more than expected, for kld at least.