IMO
This week, no.
When the Dolphins have been mathematically eliminated from playoffs? Yes. Then, do the following:
1. Remove Matt Burke from defensive coordinator. Have his box packed, escort him from the building and do not say goodbye.
2. Elevate Rizzi to interim head coach for the remainder of the season, giving him Defensive Coordinator calls. He can select who he wants for special teams coordinator or continue that role as well.
3. Give offensive coordinator calls to the current OC for the remainder of the season. Not like it matters.
4. Use remainder of 2018 and offseason to evaluate the team moving forward in regards to the QB position, drafting, scouting, conditioning and try to find a coach who's needs you can meet ($$$). I will say if Rizzi performs well, perhaps keep him in mind, but definitely keep him on the team, perhaps elevate to DC, otherwise let the new HC select their O and D coordinators. Hopefully Tannehill can perform well the remainder of the season so we could possibly trade for a high 2020 draft pick.
5. Remove Tannenbaum from his position and replace with someone more knowledgeable (I admit I dont know many off hand, im sure they are out there).
6. If no trade options, retain Tannehill for 2019, draft OLine and DLine players. If Tannehill traded, use Fales and Falk for 2019. Tannehill can still provide valuable advice to the younger QB's.
7. Compete as much as possible under new coach in the 2019 season. Analyze who stays and who goes for 2020.
2019 is shot already for the Dolphins. There are gaping holes on offense, defense, QB, everywhere. Best bet is to not necessarily tank, but to remove the things that hinder competition and shoot for the 2020 draft as a leapboard for the next 5-10 years.