Unless Wallace breaks out and has the season his talent is capable of delivering, we won't have a top receiver corps.
Hartline is a nice cog in the machine, but won't improve in yardage beyond what he already delivers and won't be a TD machine in his career. Gibson's ceiling is probably 8 or 900 yards and 8 or 9 TDs. Not shabby, but also not top half of the league. Matthews and Landry can be great inside players with physicality and YAC potential, but are unlikely to be elite in terms of yards and TDs.
It's all about Wallace, if we're talking about a performance that transforms our offense. He's the guy who has to add maybe 500 yards and 8 TDs to his production last year if we want to add playoff-level offensive output to our season. The rest of the roster can really only be expected to make incremental improvement.
Over to you Mike...