I suspect in 30 years we'll be seeing million-mile EVs… but they'll probably be on their second or third infotainment system

They still have control arms, ball joints, shocks, tie rods, bearings, and rubber and plastic seals and other bits that will wear out, dry out, or degrade. Not to mention a lot of electronics with limited-life components such as capacitors. The oldest modern EVs are just now getting to the age where those sorts of repairs will start to become necessary.