IMO the front office shouldn't be making any press releases about how they wished they could have resigned so and so...That just makes them sound like a petty jilted ex lover.
By staying silent, it tells me they were A-Ok letting them walk...that they are replaceable, which they really are. Were they nice? Yes...Were they dominant at their position? Nope.
Should they be looking to move on from Ertz and Conner? Probably. Each of them, though, may have value to another team via trade. I think you keep them around, as long as possible...even up to trade deadline. Heck, that's how the Cards got Ertz in the 1st place. They monitored him for weeks/months until Philly was ready to pull the trigger at whatever price.