Who/whom, copular verbs, and the infinitive
Now, I’ve been rolling this question over for few weeks now. I personally believe whom in the cases, but on we go. After writing most of this, I think  should be who now.
The infinitive phrase/clause normally takes the objective case as its “subject”.
“I wanted to meet him.”
Thus, the corresponding interrogative:
“Whom did he want to meet?”
But what happens if you take this construction and use it with a copular verb?
 “Who/whom am I to judge.” (?)
 “I am who/whom to be.” (?)
Which may correspond to the declarative sentences (U=unacceptable; A=acceptable):
[1a] “I am he to judge.”
[1b] “I am him to judge”
[2a] “I am he to be.”
[2b] “I am him to be.”
[2c] “I am to be he.” (U)
[2d] “I am to be him.”(A)
It is possible to expand them into relative clauses:
[1a'] “I am the person who can judge them.”(A)
[1b'] “I am the person whom can judge.” (U)
[2a'] “I am the person (who) you should be.” (U)
[2b'] “I am the person (whom) you should be.” (A)
The construction has two verb constructions (one copular and the other infinitive) vying for dominance. So thoughts? These conundrums are fascinating and, due to my obsessive-compulsiveness, frustrating. </p>