We applied to Indiana too! 
Delaware and South Carolina were the other EA decisions that came in pretty quickly. Even some of the RD schools we applied to might give us an answer sooner. We applied RD to Tennessee, they announced all EA decisions in mid-December, then RD decisions are rolling through 2/15. We just missed the EA deadline by a few days so we may actually hear from them before we get an answer from UMass.
And I agree with you, as time goes on his interest in UMass is fading while he is getting very excited about the other schools.