My recent thought has been that signing Skubal to a long-term deal would go a long way toward signaling to the market that we are serious about contending, which would make us a more attractive destination.
If we let Skubal walk next year, that may not hurt our position with free agents all that much, depending in large part how this season goes and what our roster looks like next winter.
If we trade Skubal for minor leaguers this winter, however, I believe that would be an unmitigated disaster in terms of our ability to attract top talent to the team, because that would likely be seen as an active move toward pulling back on competing this season after making the playoffs the past two seasons. IOW, it would look like we're going into another rebuild. Fair or not, I do believe that would be the perception.