If the Lions make the playoffs keep the current staff, but if the Lions blow it they could fire the current staff, BUT finding a coach that's worth a crap (as you said Golden Latias) will be hard. I don't know...The Lions might just have to settle with Schwartz regardless.
Honestly, if the Lions make the playoffs this season, and can do the same next season that would be great. It would show that the Lions are taking steps forward in the right direction. If the Lions make the playoffs this season, and miss the playoffs next season that's taking a step back IMO.