If anything Neri was the one who wanted to replace Tom.
So Neri wanted to become the new family lawyer? Because that was the only thing that Tom was at that point.
Sorry, S_B, I did not make myself clear enough. I think Neri wanted Tom out of the way so he would clearly be Michael's Number Two man, AND Consigliere.
"Io sono stanco, sono imbigliato, and I wan't everyone here to know, there ain't gonna be no trouble from me..Don Corleone..Cicc' a port!"