American Express has Hilton have launched a 50% conversion bonus for Membership Rewards to Honors through April 14, 2020.
The offer is likely only available for Amex cardholders in the United States. Membership Rewards program conversion rates and offers are country-specific and sometimes even account specific.
You can access Hilton page for hotel awards here.
You can buy Hilton Honors points during their frequent sales at 0.5 cents per point. This would value the Membership Rewards points at 1.5 cents each when converting to Hilton Honors.
I do not doubt that these international hotel chains will survive the coronavirus pandemic and recession that will surely follow as they have gone asset-light. Hotel owners and REITs may default and, as a result, some hotels close and/or rebrand.