Yes, but although it is unpopular to say around here, Constitutional carry was a loser in most of the legislative surveys that they sent out and got back. I have heard this firsthand from a rep whose default position would be in favor of Constitutional carry. It was the case even in many rural and diehard Republican areas.
This honestly wouldn't surprise me at all. Of course it's a big hit with gun enthusiasts and current permit holders: No more dealing with permits for something we already do.
It's everyone else that is the problem. Non-owners and anti-gunners crap their pants at the phrase "the law would allow people to carry guns without a permit". Nevermind that Indiana's permit requirements are basically "can you buy a gun in the first place? Then you're good.". They assume that a permit means something, or has some kind of limits that will keep them safe from their internal stereotype of the knuckle-dragging redneck with a .45 hanging out of his pants who goes around looking for people to shoot. On top of that, you have opposition from the fudds who don't believe in the right to anything but a shotgun for deer.
The odds were long from the moment "the law would allow people to carry guns without a permit" became the popularly understood explanation. Anyone who didn't have a gun immediately went "Oh my gawd, there are gonna be people with guns everywhere! How will we survive!?", not stopping for an instant to think they're already surrounded by people with guns every day and nothing bad ever happens.
It would be nice, but fact is even in Indiana it's a tough sell.