That still leaves a metaphorical Grand Canyon-sized hole that future games will try to fill. Given the mobile market's track record for lazily copying trends, we’d see most of those games fall back towards examples that previous mobile games attempted to POE currency trade set. Since this bill is cracking down on so many tools that games as a service abuse, I expect many more one-time payment games like Super Mario Run.
Actually, Super Mario Run is technically an example of how expansion packs are exempt from the bill since you can play the first world for free and pay to access everything else. Mobile games have almost always had a massive stigma, and even after introducing this bill, many consumers would be hesitant to drop $10 on a game they expect to be shallow and cheaply made. That's even a part of why Super Mario Run had a (relatively) rocky reception. Mobile players expect they never have to commit their cash to get into a game's meat and potatoes. But should the US become a country where most freemium services are not viable products and most competitors charge up front, this free-to-start model would suddenly be a tool for dealing with that stigma.Larger and more ambitious mobile games will likely take a similar approach, but with episodic releases like the decently receivedFinal Fantasy Dimensions.
Aside from following whatever current mobile leaders survive the transition to fair monetization, I also expect service-styled games to try one other idea. Since most successful mobile RPGs add content in bulk updates, we might see new ones start charging for major content updates as if they're micro-MMO expansions. It's obviously a long shot to start charging money for things that used to be taken for granted as free, but that's kinda why gacha games are so reviled in the first place. If the premium MMO market is any indication, only a select few mobile games could thrive with this model (if any), but they would become very notable contenders on that fact alone much like how very few MMOs survive on subscription models.
We’ll also probably see even more idle clickers stuffed with ads than we currently do and we will hate them. Actually, we might see a lot more games use ads in the place of current payment systems. Many, many more ads. That'squite scary actually, but it's easier to buy Path of exile currency multitask while ignoring ads than open loot boxes with one hand while using the other to work a part-time job, so it's the lesser of two evils? I hope?