DALLAS — The Lakers’ three-peat hopes died in a hail of 3-pointers from the Dallas Mavericks today in Game 4 of their second-round playoff series. The Mavericks advance to play the winner of the Memphis Grizzlies-Oklahoma City Thunder series in the Western Conference Finals. The Lakers face an uncertain future after Phil Jackson coached his final game. There is a possibility the roster could be overhauled in the offseason. There is a probability of a lockout starting July 1, so the summer also could feature a lot of nothing. There will be no player movement if they are locked out and it’s unlikely the Lakers will name a replacement for Jackson (Brian Shaw?) until after the labor issues are settled. The team has declined to offer contracts to its assistant coaches and other support staff, a sign that it believes the lockout could last a good long while.