[Multics]

I think this deals with your main premise of the nebulous 'room'.

From the paper Demographic Consequences of Defeating Aging.

'Moreover, if some members of society reject to use new anti-aging technologies for some religious or any other reasons (inconvenience, non-compliance, fear of side effects, costs, etc.), then the total population size may even decrease over time. Thus, even in the case of the most radical life extension scenario, population growth could be relatively slow and may not necessarily lead to overpopulation. Therefore, the real concerns should be placed not on the threat of catastrophic population consequences (overpopulation), but rather on such potential obstacles to a success of biomedical war on aging, as scientific, organizational, and financial limitations.'

Full paper: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3192186/