I feel it would have ultimately been detrimental.
The main issue with the PS3 was not a lack of power, but how byzantine the architecture was to develop for, and a more powerful model would not have helped things.
An easier to develop for model might have helped, but that's still asking developers to program an "easy PS3" and "bastard hard PS3" version of any given game, which is just unrealistic. After all development costs for the cell were already high enough before asking devs to put in extra work on top.
The reason why the PS4 Pro gets supported is the easier x86.