I will start with KI. I think when MS announced it as a “platform” this was kind of a misnomer. Looking back it’s not so much a service game as it is an episodic (or seasonal) release. Fundamentally I think all fighting games will have some variation in this season pass kind of model, although maybe not as extreme as KI.
As far as the “games as services” model, I think developers are looking for ways to evolve their monetization. They have to do this. Making games is a hard business and so many developers go under despite making good games. As with anything there are lessons to be learned about what sort of monetization gamers will like, tolerate, or boycott. And frankly I don’t think gamers as a whole act rationally so I think it’s going to be a while before developers find the “sweet spot.”
The battle royale games have done this by introducing a cheap as heck game, giving it away for free (except PUBGS - which has pretty much died now as far as I can tell) to get a huge player base then charging for micro transactions and cosmetics. I don’t really get it, but I don’t mind being able to pick up and try the games for free. But the key seems to be keeping overhead low, playerbase high and the transactions “inoffensive.”
Destiny and Anthem are a very different model. Much closer to the MMO model only instead of a subscription fee they try charging you for periodic releases of content. Destiny 2 has been a mess because of the pricing scheme angering fans - but purposely encouraging new players to join, which makes some sense. We will se his anthem does it. But the key to this model is convincing the players they are getting good value and giving them something to keep coming back to. I think this model is great because it is being used for AAA games, but there’s no way people are going to get the quantity of content they associate with a AAA game right off the bat. So we will see if they can sustain it.
It’s worth noting that a third option is something like MH world. Where somehow they just sell you the game and then continue to release content for it. In let capcom can do this because they haven’t made a new animation rig since MH3 - and the MH series is the champion at reusing assets. But even so it’s impressive what they have done. We will see what the first paid expansion looks like this fall.
TL;DR I think the model is fine and has a place in the pantheon of gaming. There’s actually a few kinds and it will be awhile before developers work the kinks out.