I don't have any concerns, since I doubt I will play a skill based game so it really doesn't effect me one way or the other. If this doesn't work for the casinos they won't order the game. Even if the casinos order them they won't predominate the casinos unless of course they pull in the young demographic to start gambling slots in the casino. If that happens and the casino sees they are making money on a new demographic they are encouraging to gamble then I guess we'll eventually see a lot of skill based casino games in the casinos where it's legal but I would think they will still have plenty of the traditional slots too as they won't want to lose any demographic they can make money from.
I agree with you that there's going to be a cap on what people can win regardless of how great their skill level is, because the math will have to take into effect that slots are a negative expectation game and skill based or not, I doubt that will change.
On number two, I don't think any slot can strictly be skill based, the skill based part in my opinion would have to be based on a game feature, bonus or perhaps a community game type thing, or a combination, but it's early days and I'm just guessing. If I notice any games that are advertising themselves as skill based I'll try to get some information on it at g2e but the design of a game at G2e can change before it actually makes its way to a casino floor for real gambling so I don't think we'll really know what they are coming out with and how they will work until they are actually on a casino floor for gamblers to try.