I don't see that is accurate, or can be said with certainty;
1) We haven't seen anything but three weeks of releases so far.
2) The game can be played with fewer models - "inexpensive" is a debateable term, but it is certainly less expensive than WFB.
3) TBH, I don't know that AoS is really pitched at younger people - those models are NOT clip together and the rules, while simple, aren't quite as simple as people pretend.
4) We don't know what they are going to do - and their strategy might stay exactly the same (probably will). Yet, AoS is a little immune to those - you buy a model with the warscroll. There is no restriction on what you can field. If they release an army, someone could add a little bit of this and that to their force and there would never be an invalidation of it - because Warscrolls are free. And the tone (set in the Compendiums) seems to be "just use count as". And, of course, the Warscrolls are so simple and have no points, so you can pretty much invent whatever you might desire.
5) AoS has no balance mechanism except the players. It is completely immune to power creep ... or it is inherent to the system. Take your pick
6) There are four pages of rules. They seem very clear to me, because they are so simple.