Yes, this is the rebuttal, and a valid one, His foreknowledge that His brethren would repent and finally believe. I have answered that rebuttal in previous post.
Really what you are asking is contrary to whole idea of purgatory . That if one sins and repents there are no consequences…You are asking our brethren scenario to have no consequence for disbelief, and abandonment of their brother and their mother, at one of the most crucial andl agonizing moments in History.
Anyways, Jesus also foreknew this very debate, yet chose to leave it as a curiosity for some.