They're not dead yet...
More accurately, not even close.
The Rolling Stones have had 3.5 million people plunk down big bucks to see 110 shows thus far on their A Bigger Bang Tour.
In addition (and let's be clear here, this is in ADDITION), an estimated crowd of 2 million saw the band perform at Copacabana Beach in Rio de Janeiro back in February.
I really don't care about how much money they made vs. U2 or whatever, but if you are you can see it all here.
Many have said, "The Rolling Stones this...", or "The Rolling Stones that...", "Corporate slaves blah, blah, blah, blah...". With figures like this, I'd say they're still very much a relevant act.