The F-35C was always supposed to work with the Rhino, so even if a draw down allows the retirement of the legacy models it won't fundamentally alter the concept.
Don't forget that there are also Rhinos and Rhinos. The ones with the AESA and a few other toys are awesome, the ones with the APG-73 aren't! So perchance a draw down would also see a consolidated AESA only force.
One thing is certain, that Boeing has for some time been beating the Super Hornet drum and it has many supporters within the USN, mainly as a result of it having twice the engines of a F-35.