If you're talking about europe it kinda helps that it had enough supply to completely fulfill demand right away.  

It depends on what you mean by "around 30 Million" ...

At this point in time I think a fair estimate for the PS3's sales at the end of 2008 is between 20 and 22 Million units sold worldwide. If the PS3 had a 15% improvement year over year for the first half of 2009 it would still only average 1 Million units a month and be sitting at 26 to 28 Million units worldwide.

PS3 has sold roughly 3.5m consoles this year so far (using vgchartz data), so thats 5 months at roughly 700k per month, assuming this continues throughout 2008, with boosts and holiday sales it should sell 12+m in 2008 total, so end of 2008 ltd sales will be at least 20m.

 we have only had 4 months

30 million is a fair assumption, but the 360 will almost certainly right on its tail at that point

sounds plausible

Nintendo Wii could be well over 50 million by the end of June 2009.

definetely likely to happen

Very plausible as well.  Good to see someone making predictions that aren't coming out of their bias asses.  Thought I was one of the few left that would make them actually based on the facts.  Kudos to you bro. 

id say the ps3 slows down by end of this year drastically and barely hits 15 mln. then hits the wall and slows more with little spikes with bigger releases at the end id say ps3 and 360 about 25-30 muillion lifetime then the next gen ones comes out. while the wii hits 50 mln by april 1st 09