I think that the PS3 getting 100m consoles is an absolute impossibility. The primary reason again is price. The PS3 is twice the price in most markets vs. the PS2.
The ONLY, and I mean ONLY way the PS3 could get 100m is if Sony kept it as the lead console for atleast 8 years. The PS2 has sold about 17.8m units per year. The PS3 is on track to get maybe 5m to 5.5m units it's first year (not including Nov-Dec this year, mind you). I don't expect the PS3 to average more tham 10m units a year over it's entire lifetime.
Again, due to the price it's not financially viable. Not only this, the marketplace is FAR more crowded. This time you don't have that wonderful position of most likely getting a 60% marketshare in every market. The Wii will own Japan, and should end at 50% or greater of the Japanese market, the 360 is becoming a beast in the US, and Europe has lots of options and systems available for Sony to get the same kind of penetration.
Think about it.......Last generation, we saw Sony with nearly a 65% marketshare. Right now it's at 20% and staying right there. Thats HUGE. Yes, the PS3 will do better, but it'd have to sell 200% more systems to get to that same level...It's not going to happen. Could it happen with revenue? Yes, and it probably will. However, with the pricetag, the units sold won't get near there.
Not only this, but we have seen that software sales are suffering. The 360 is dominating the US in software, the Wii is selling tons of systems for it's tier ratio, and the PS3 is mired in a near-Wii tier ratio. That's absolutely horrid. The 360 is at 5.5 games/system in the US, and the Wii and PS3 are still at 2.5 to 2.75. Sony needs to get more games in the hands of gamers to start making up major ground.
Back from the dead, I'm afraid.