Exchange Subsidy: Feature or Bug?

FoIB Brian D offers this poser:

Many "mature" workers have resisted early retirement because it's been so difficult to find health insurance due to age and/or pre-existing health issues. 

Given that the ObamaTax premiums are required to be lower for older workers (and higher for young'uns), and since ObamaTax-compliant plans are guaranteed issue, how many folks in their early 60's will now feel comfortable bailing out of the workforce, taking their experience and institutional memory with them?