I can't really say for sure that cloud gaming's the future but you know what? This kind of question was asked before years ago, and it had something to do with digital sales. Yup, some people asked if digital sales was the future. Many thought digital sale wouldn't take off, it wouldn't work, etc. One example is Steam, when it was in its first years, wasn't much of a hit yet. Many didn't like the service, some were just baffled by it, etc. But years later, Steam is now a big hit among PC gamers. It's convenient, you get great games without having to walk to the store, etc.
So maybe cloud gaming will work soon enough. I'm sure in a few years time, we'll all be raving on about cloud gaming. So let's wait and see.