I mean, if Jesus were to appear to him, turn water into wine, raise someone from the dead etc etc, you are saying Thomas would still have stuck to his guns?
If they had guns then the Roman's might have been defeated but to answer your question, yes. In fact, all the disciples had doubts about the resurrection:
Mat 28:16 But the eleven disciples went into Galilee, to the mountain where Jesus had given them orders to go.
Mat 28:17 And when they saw him they gave him worship:
but some were in doubt.
Mar 16:14 Afterward he appeared unto the eleven as they sat at meat,
and upbraided them with their unbelief and hardness of heart, because they believed not them which had seen him after he was risen.
Luk 24:24 And certain of them which were with us went to the sepulchre, and found it even so as the women had said: but him they saw not.
Luk 24:25 Then he said unto them,
O fools, and slow of heart to believe all that the prophets have spoken:
Luk 24:26 Ought not Christ to have suffered these things, and to enter into his glory?
Luk 24:36 And as they thus spake, Jesus himself stood in the midst of them, and saith unto them, Peace be unto you.
Luk 24:37 But they were terrified and affrighted,
and supposed that they had seen a spirit.
Luk 24:38 And he said unto them, Why are ye troubled? and why do thoughts arise in your hearts?
Luk 24:39 Behold my hands and my feet, that it is I myself: handle me, and see; for a spirit hath not flesh and bones, as ye see me have.
Luk 24:40 And when he had thus spoken, he shewed them his hands and his feet.