I don't see how it could make any difference.
He's already an idiot, a delusional narcissist, and a compulsive liar, so it's not as if he could become even more detached from realitybthan he already is. And his supporters don't care (and likely don't even notice), since they're even dumber than he is.
And it's not like he"s going to forget his platform, since it's pretty much just hating immigrants and LGBTQ, dicking over poor people, singing his own praises and scamming as much money as possible, and that's all as natural and automatic to him as breathing..
Really, there's just not much cognition going on there in the first place - it's more in the nature of infantile immediacy and animal instincts - so I can't see how any loss of it would matter much.