Whining that the guy we "have" doesn't measure up to the guy we "need" is the type of whiny wishful thinking usually reserved for naïve leftists. Our responsibility is to deal with the reality that exists, and to do the best we can with that reality until presented with an opportunity to change that reality.
Trump is going to be President until January 2021, and if some in the GOP are hoping to replace him with Pence before them, they need to wake up and realize that would only happen in a context where Democrats seize control of both houses of Congress, and likely clobber us in 2020.