Unless Loomis changes his evaluation of the team as shown by his public statements and actions over the past few years and his methods for building team, yep, it doesn't matter.
Now the new coach may have a different view of the state of the team--we are not very talented, we need a major rebuild, we need to stop extending contracts of older players, we need to trading away future and multiple draft picks.
But yes, the key person is the one charting the future direction of the franchise. If it is the new head coach who will be our de facto general manager as was Payton, then this hiring is incredibly important. If it is a continuation of the last three years, then good luck to all of us.