Doesn't really matter.  The DS by nature would have a lot of replacement sales too.  I have kids and they break those suckers like nobodies business.  Point being while the DS itself has a pretty solid failure rate by usage it will have been lost, broken and replaced more than enough to balance any PS2 replacements.  It's also got enough market share (like the PS2) to probably see a steady rate of replacement sales with people who still want to use it but their's has failed finally.

It evens out for the most part so there's little sense (unless you're talking huge, unprecidented levels of replacement) invoking it as a reason to doubt the "true" sales of a console.

Theres already what like 20 Pokemon games for the DS? It's not much of a system seller anymore. Black and White which had one of the best first weeks of any game only raised hardware sales 17% but in Japan sales doubled, I still can't see sales over 20K for Japan on the release of B&W2 now though, not with sales hovering around 1K and the 3DS out.

Unless there's a new different original big game coming out for the DS it really has no more system sellers left.

3rd world markets will keep PS2 alive for some time. Hell thats why its thriving now.

No king slayer can take the iron throne from the PS2!

DS still sells (for a dying console) well every except Japan, it has a chance.

Remember that the DS sold a lot less software than the PS2 though. Also, why does the Japanese market matter more than any other market?

And the third world markets are notoriously the hardest to properly track sales. IMO PS2 isundertracked by up to 1 million in those areas alone

Except the kingslayer is one of the kings own guard.

Anything can happen yet. Just keep in mind that Pokemon Black & White 2 has yet to come out, let alone whatever other big games Nintendo still has planned down the road for the original DS.

It will remain the king, but in my opinion the ds was as succesful in less time, unfortuately ninty doesnt do the 10 years plan.