Nobody expects the Warriors to trade Russell right when the clock strikes Sunday. But a crossroad awaits before August. When the Warriors eventually reform this team, with eyes on a 2020-21 title run, opposing executives wonder whether they’ll keep three guards who earn more than a combined $100 million per season or swap one to better balance the roster. Steph Curry and Klay Thompson are the franchise staples, locked into multiyear pacts, cozy in their Bay Area mansions. They aren’t going anywhere. So the vulnerable one is Russell, the highly-paid newcomer with a tenuous future, unable to control where exactly he will spend the final three seasons of his recently signed four-year deal.