Combine this:
http://www.vgchartz.com/forum/thread.php?id=27380
First 18 months software units (US):
Wii - 50 million (not including Wii Sports)
X360 - 28 million
PS3 - 20 million
PS2 - 42 million
First 18 months hardware units (US):
Wii - 9.5 million
X360 - 5.2 million
PS3 - 4.2 million
PS2 - 8.5 million
With this:

And it doesn't seem quite the doom and gloom for third party software.
The big flaw in the logic of the artcle is that first month sales are not the best to judge Wii titles.
If we judged M&S on first month sales, it wouldn't look like a big seller. Eight months later and it's a juggernaut of sales.







