You've spent a billion since you last won the league, what players are 'safe' in your scenario? How many players/how much will this cost? what happens when you are no closer after a season or 2? Scrap it all and start again?
As I said in my previous post I don't think many are safe.
DeGea, Varane, Dalot, Shaw, Elanga, Sancho are players who I think are worthy.
Cavani, Pogba, Lingard, Martial and Greenwood all look like they are leaving. Maybe Ronaldo too. That's a huge void in your first team so Rangnick really needs to bring through some younger players once fourth is lost as it surely will be .
Bruno, McSauce and Rashford probably stay but Matic and Mata will go. That's seven first team players at least who will go. A lot by any standards and means a complete reset and a change in the culture of the dressing room. Anything less than that and the same issues will remain. This team are mentally weak and it didn't matter who the coach is.