I don't think any new interstates that actually go through more than one state stand a chance. Today there just too expensive and much harder to build than 50 years ago. States just can't ignore there own crumbling infrastructure to build brand new,sometimes unnecessary, roads(I-73). To be honest because of this, I can't see new cross country interstates (I-49 in Arkansas, I-69, I-11, I-14, and perhaps the new I-87) ever being fully completed. There's just not nearly as much a motive and reason anymore. I think for this point on ,there should not be any more new interstates created.