It goes without saying that the shotgun is very clearly over-performing, changes will be coming in the future to address the majority of the concerns while also keeping the concept of the weapon alive.
Jedi not being able to block: This was unintended and will be fixed in a patch, they should be able to block the shots like every other blaster.
One-shotting any NPC: This has been around forever with any fire based weapon and has always been a nuisance to approach. Upon testing there didn't seem to be much issue with this, however with 10+ people at a time using the weapon it's clear to see that it is an issue. We'll be looking into alternative NPC behavior if it's possible.
Flamethrower becoming useless: I'd rather buff the flamethrower if people believe it is under-performing than try to balance two different weapon types around each-other.
"Just don't use it or buy it": We all know this mentality never works, so I'd rather work on the weapon to get is somewhere the majority is comfortable with.
TLDR; I personally don't see a reason to change it from a shotgun as it's intended to be a "Dragon's-breath weapon".