"By the end of the first wave of the epidemic, an estimated 97% of the population of the United States will still be susceptible to the disease and thus measures to avoid a second wave of the pandemic prior to vaccine availability will be necessary."

From documentation of the @IHME_UW
model on coronavirus incidence in the US, which it appears is currently informing US government policy - http://www.healthdata.org/covid/faqs 

Further: "Maintaining some of the social distancing measures could be supplemented or replaced by nation-wide efforts such as mass screening, contact tracing, and selective quarantine."

If true, what does this suggest about likely continuance of international travel restrictions, and much else? What about prospects for continuance of disease in reservoirs where such measures are impossible, such as war zones, leading to ongoing global risk of a 2nd or 3rd wave?

Not good.

The much derided herd immunity strategy had as its positive side that it would have made subsequent waves less likely (not saying there were not negatives).

Essentially, current social distancing and related measures aimed at slowing the spread of the disease appear to be betting on the quick development of a vaccine. How long can they, otherwise, realistically be continued? This is a question few are asking.