I don't think there will be a major change this generation. There might be the odd game that has some half-cocked idea that you have to register a serial number on their website to be able to play the game. Even though PS3/Xbox360 still have a few years left in them, it's a bit late to be chaging all the rules. This would push people away and it's completely different to the PC because you buy a Sony branded game, Sony hardware etc. You are buying in to the PS3 and placing your trust in Sony an no one else. On the PC you buy a PC from anywhere and each game developer is marketed to you individually. Also casual gamers make up a huge % of the console market so I don't think it would happen.
The general opinion is that the PS4 (and xbox 3/720) won't be on sale for 3-4 years yet. In that time, both broadband connections and harddrives will get bigger and cheaper.
I've had a look into the future and this is what I saw:
I think the PS4 will be launched with no disk-drive and be download only. When you turn your PS4 on, you will be greeted by a service that is a cross between itunes and Steam. You will be able to download any game (for free

) and play it for 1 hour. After that, it will sit in your game list and you will have the option of 'delete' or 'purchase' (or just leave it sitting there ghosted out, bugging you because you want to play more of it (£££!)). For more casual gamers, there will be 'gaming hours' where you can buy 6 hours of gaming on anything at all you want. So if your mate(s) texts you and says "do you fancy a game of Fifa 16 later?" you could just use a gaming hour and play it. You will have plenty of space of your 4TB HDD and your 150/200mb (or 50mb if you're cheap

) internet connection will be plenty to download it in the time it takes to cook and eat your dinner. Or if you have some family round and someone says "we were playing that new Guitar Hero game at someone's house, it's good put it on" then you can. Now, if you use 2 gaming hours on this and you enjoy it, you will get those gaming hours back if you click purchase on the already installed game in your game list.
So what would this mean? Well game shops would have their days numbered. Selling consoles and accessories wouldn't sustain a shop selling to one town, only a website. Consoles would get sold in supermarkets, electrical shops and music/entertainment shops as they do now.
And what about game reviews? Well, I'm not sure about that one
