If the season ends now, Heat(2) will play either Wizards, Raptors or Bobcats on their route to the ECF.
Pacers will play either Bulls, Nets and Hawks so finishing 1st in the East doesn't sound that attractive now as it's a tougher route to the ECF. At the end of the day, if Pacers don't make the ECF, Heat will still get home court advantage.