Also dont see what that has to do with your comment of "we would have this same discussion very soon if growth is going to increase".
Because 2 MB blocks don't solve anything. All it does is kick the can a little bit down the road.
Obviously that is true to any actual approach. At the end it is absolutely inevitable to raise the blocksize at some point in time.
And yes, after implementing that arbitrary spam protection it was clear that a problem was solved but another born. Even LN or segwit are nothing more than kicking the can down the road a bit.