I'm not trolling, I've read Keurzweil's book... It's extrapolating. If I was a risk assesor, I'd err on the side of a mass extinction event over us consuming the entire universe as data.
There's already been 4 extinction events, it's pretty safe to bet that it will happen again.
But they happen 50-100 million years between each other and usually take thousands of years to take full effect once they begin.
Even if technological singularity takes an extra 100-200 years to really happen, if any significant 'AI' is achieved, a lot could happen in a thousand years, let alone a million.
