My personal thought would be to let NuGNR die as far as this perceived image of them being "a band".  To bring yet another guitarist in again - yawn.

If he wants to write more music, I say knock himself out - get 100 different guitarists to write guitar licks for him.  He can then pick the stuff that he likes the best and cut and paste it into his next solo project.

But as far as hiring someone else again just to try and hold this version of GN'R out as being a band - don't waste your time, the revolving door of band members has spun for too long.  I think there is only one person left he can call in order to sell to the public the concept of GNR actually being a band again.  BUT from my read that ain't ever happening.

But, the problem for Axl is that the money these days is made from touring not album sales.  So you come back to the same problem of how are you going to sell the concept of GN'R being a band to the public when there is yet more lineup changes with new guys, playing the old guys (in some cases the old old old guys stuff).

It's kind of ironic, Axl wanted to control everything and he basically got what he wanted.  From an artistic point of view he has done whatever he has wanted with no compromising with other band members.  But this is a double edged sword, in the process of achieving this he has bascially destroyed all marketability of the other guys in regards to the concept of GNR actually being "a band".