It’s a midsummer day and the sun is high in the sky, but the cavernous bar on the green, hilly 68-acre Rios-Lovell Winery & Event Venue stands empty.Although Rios-Lovell and around 50 neighbouring wineries in the San Francisco suburb of Livermore typically do not expect many clients on weekdays, they also know that Generation Z and Millennials are not drinking as much as their elders.However, the 35-year-old Rios-Lovell winery ships a couple of containers per year to China, said event manager Joe Feng.It may be sampling the future.After a sharp decline in US wine exports to China under US President Donald Trump, the worst should now be over with a sparkle of hope on the way, said Christopher Beros, the California Wine Institute trade association’s director for Greater China and Southeast Asia.“There is anecdotal evidence that this decline has bottomed out and there is hope that exports will resume in the months and years ahead,” he said.