No its been done many times before. I must admit though that its definitely not a bad idea.
I know it's been done before, I don't know about 'many' but I know that it has been. The issue is that not all companies take advantage of it, and even on PS3, only Resistance is reported to be doing that. I'm just saying that if more companies took advantage of it, and the fact that they can't really complain about space anymore since Resistance will prove that you can do an all in one package for all reigons.
First of all, all this is a BR/ps3 marketing ploy. If anyone doesn't beleive this then you need to ask yourself, why is sony/insomniac advertising the games data size to begin with? There's your answer.
Because it's a common question among gamers and critics alike. Look at this forum post and youll instantly see topics that relate in some way towards BluRay and/or it's capacity. We're talking about it RIGHT NOW. It's one of THE MOST criticized piece of hardware in the PS3 and I doubt that anybody would disagree with me on that.
Honestly, just even revealing this info is going too far, and I for one appreciate that he answered one of the most asked questions on boards everywhere.