When the Jacksonville Jaguars or other NFL franchises "demote" someone to the practice squad, it doesn't mean the end for that player's chances at contributing. In fact, a lot of players come off of the practice squad to impress and satisfy what the team asks of them.
So, with a packed roster that is seeing a greater depth of talent than the teams of the recent past, every cut hurts. However, signing players to the practice squad keeps them improving and available for when the Jaguars might need them the most.
It's no fun to be on the practice squad.