I wonder if this is simply the ultimate ego trip for a guy whose ego is already the size of Texas? There's no higher office in the land than Prezi and maybe he just likes the idea of all that power. Perceived power or otherwise.
I agree. He's already said that domestic and foreign policy would be looked after by the VP. A clever move, given that his complete lack of foreign policy expertise has been brutally laid bare on several occasions. It also means that the Don can get on with being a media mega-star, whilst his VP does the hard work and gets the blame when things go wrong.
http://www.nationalreview.com/article/438093/donald-trump-vice-president-mike-pence-active-role -- "Vice President Pence could realistically set the agenda for most of the policies of a Trump administration outside of a few bright and shiny objects of particular interest to the Donald."
http://www.thedailybeast.com/cheats/2016/07/20/report-trump-wants-vp-to-take-over-all-policy.html?via=desktop&source=copyurl -- "Donald Jr. explained that his father’s vice president would be in charge of domestic and foreign policy."