I don't think rebuilding is the best strategy for this team right now anyways. The fan support is at an all-time high, they've locked up DeRozan long term, they've been a winning team now for the last 4 seasons (never had that success during the regular season for that long of a period), and they are still one of the top teams in the East if they could bring back Lowry. As well, Cleveland's dynasty could come crumbling down if LeBron leaves after next season, which would leave the door wide open in the East for teams like the Raptors, Celtics, Wizards, Bucks etc. It's not like another team in the East would be a lock to beat the Raps in a 7 game series - I mean sure Boston or Washington could win a series against the Raps, though at least the Raps stand a chance. If the Raptors were in the West, then different story. Seems like all the super teams will be out West, none in the East unless LeBron decides to stay in Cleveland.
Even if the Raptors don't win a championship in the next 3-5 years, it's probably just best to make the playoffs every year in hope of going to the 2nd or 3rd round, even perhaps the Finals one year. Keeps the excitement around the organization, market Toronto as a good destination for NBA players & make money from fans in the stands. Also, MLSE has to factor in the Leafs. If the Leafs continue their upward trend of winning and the Raptors decide to rebuild & lose while that happens, everybody will forget about basketball in this city. At least if the Raptors put a winning product on the floor every night, they will fill the arena.