I agree with you on that. I think the market and the average consumer is so much different than it was 10 years ago. Today, if a person walks into a Best Buy and sees a PS4 sitting next to the PS4.5 and they ask the clerk what is the difference, the clerk will simply say. They both play the same games, but if you buy the 4.5 system, the games will run better, it has a bigger hard drive and better graphics. The consumer will then decide, do I want to spend $299.99 for a 500gb PS4 or $399.99 for 1TB PS4.5 that has better graphics and more HDD Space. The key to all of this will be that regardless of what system you buy, all PS4 games will run on both consoles no matter what.
One thing I have seen a few people post is about the existing, already released games. I really don't think that you can bring home a PS4.5 and all of sudden your copy of The Division will be running at 60fps. I am sure if this is all true, that some games may get a patch to boost performance, but I don't see it happening with a lot of games. It will be more of a forward thing. But with that said, they would need to have some games ready to show the difference, because they have to have something to show the consumer why one is more expensive than the other.