Ed Boon did say in one of the E3 demos or interviews that they're looking at making XRs more worthwhile this time. He said they heard fan feedback about how much more valuable breakers were. Can't be bothered to find the video as evidence right now, I'm afraid.
It's going to be character dependent. Some characters just won't ever need to use their XR. But yeah, increasing the damage is a good start, and having them be safe (which most were in MK9 anyway, if I remember correctly). Making them change the way your opponent plays, as someone else mentioned, is another good option, but again it'll be character and match-up dependent.
Maybe they could make it so that you have to get three bars for XR, as usual, but when you use it it only takes away two bars, meaning you only have to build one more bar for breaker or two more for another XR. Would potentially make for some interesting XR into EX combos, too.