They aren't trading Lebron, that shouldn't even be discussed. I doubt teams would give up a lot for Wade given his injury concerns, so that leaves Bosh.
is really the key, besides Lebron, to Miamis small ball attack, in being able to bring centers out to the 3 point line, open up the lane, hedge hard on screen and rolls etc. he is replaceable because with LBJ and Wade in the lineup, Miami can excel at any style of play. They will have to downgrade at that position, but it'd help them get better at other positions with the money saved from having to pay Bosh
the max again.
It'll be really interesting to see if MIA goes in a different direction this off season with Bosh
leaving, as I cant see them not re-signing the other two.