Not sure how establishment Pence is, since he’s Tea Party (I’ve heard).
He seems to be a politician with Tea Party support who's also palatable to the GOP establishment, so Pence may be as good as we could hope for if Trump's goal was to stop the NeverTrump sabotage from within the party. At least he's less liberal than Christie and more reliable than Newt (who sounds to the Right of Reagan one day and to the Left of Clinton the next).