Kimi Antonelli has looked on course to replace Lewis Hamilton at Mercedes for months. But the move has now been cast into doubt. Toto Wolff has held out hope of signing Max Verstappen from world champions Red Bull. While his father Jos was seen entering the Mercedes hospitality at the Austrian GP amid a dispute with Christian Horner, the driver himself says he intends to stay. That has forced Wolff to turn to his more realistic alternatives. He’s been able to bide his time in the case of Antonelli because he’s already on Mercedes’ books as an academy driver. The Italian boasts an exceptional r…