Their weaknesses in size, rebounding, and defense will be more exposed in the playoffs when the game changes.
I think that it's most likely to be the Cavs/Warriors in the Finals again, but I think there are more teams in the West with legitimate shots of knocking off the Warriors than the Cavs have in the East, which could play a role in who takes the championship.
Toronto and Boston could make things really difficult for Cleveland, but barring any other moves, it's hard to see either of them winning four of seven. On the other hand, I think SAS, Houston, Memphis, Utah, LAC, and OKC can all make a series with the Warriors, and SAS, Houston, and Memphis, and possibly even LAC, all have a legitimate possibility of knocking off the Warriors.