Rogues are supposed to excel in non-combat situations. You're not really talking about paladins having less skills than rogues, you're talking about everyone who isn't a bard or rogue. Rogues are basically there to give a non-magical utility option, while wizards are the magical utility guys...
Bring Dexterity more in line with other stats. Take the initiative bonus away. Give rogues a level based bonus to compensate so you don't screw up sneak attack.
Not something I expect to see, but something I would love to see.
Changes to simplify DM'ing.
Non-charisma based social skills. Maybe even just rework the whole skill system.
Backgrounds was a good move in 5e. Maybe too much emphasis is on back story that no one ever sees now. Main story is far more interesting. Something that encourages players to develop...