Sony had the right strategy for me as a gamer. This is the best Sony platform/console I've ever owned in terms of hardware. I was a bit disappointed with what they presented with the Playstation 2, even though it did have DVD playback which was a huge plus. The networking of the PS2 was terrible, there was no standard hard drive, and used an archaic proprietary memory card instead of an open standard like USB. In many ways I've felt that Microsoft has regressed from the Xbox 1 (no standard hard drive, nickle and dime for features that should be open) and Sony has progressed. Interesting role reversals for this gen.
I think Sony sent the right message by including a standard hard drive (which you can upgrade yourself), wifi, free online, and blu-ray with the system. This basically allows developers to have less handcuffs in terms of releases they want to include at retail and on the Playstation Network. It gives the entire platform a very long life. Sony probably understands now that while graphics are important to a certain degree, they're getting to the point where artistic design is the main challenge and not technical hurdles that plagued 3D games in the past on the PS2/PS1. So, I'm happy that the PS3 will have a long life...I want the PS4 to represent a large leap in power rather than a minor one. Diminishing returns is something to worry about, as are development costs and time, which means a lengthy console cycle IS ABSOLUTELY required from here on out, IMHO.
I really hope that in the distant future when Sony releases the Playstation 4 that they carry over all of the features of the Playstation 3 in terms of the XMB, Playstation Network titles, etc, so that it's all fully backwards compatible...which means, the PS4 needs to have perfect backwards compatibility with the PS3. This is an even more important feature now (with the PSN network) than ever. Obviously, the PS4 should update some of the XMB and other features to a new next-gen standard, but it should retain all of the previous features.
While some systems follow a sales curve that instantly takes off and dies down over time, PS3 should have more of a bell curve distribution. Sales were low the first few years due to software library and the very high price, but as those get resolved during the middle part of hardware lifecycle you should see very high sales.