If they would've won, he would have opted into the last 2 years of his contract and then gone back to Cleveland in 2 years.
Yeah, I think he would have felt obligated to stay and defend his titles and go for the four-peat. That would have been his chance to elevate himself to the Jordan level.
Not Bird, not Magic, not Kareem, not Shaq, not Duncan, not Kobe, not even Jordan (technically) ever won four straight.
Instead, he 'only' won 2 of 4. Might as well go back to Cleveland and try to be the hero and won Cleveland's 1st title in any sport in an extremely long time, let alone the Cavs 1st.