The commercial breaks are how NBC is able to do these regularly, so I doubt they'll be doing less of them. While having so many breaks obviously isn't ideal, a little Broadway is better than none!
If you compare all three broadcasts, the most limited interruption was for PETER PAN. Why is that? Because Walmart was the lead sponsor. They enabled nbc to do limited commercial interruption, although every interruption included poor Tinkerbell with Melissa Joan Hart and her children. So random.
Actually. They were the lead sponsor for SOUND OF MUSIC, too. There were more commercials this year for THE WIZ, though, because they had no lead sponsor enabling nbc to feature limited commercial interruption. Oh well.