VP needs to be ready to be P. That requires vast executive experience, successful tenure in political offices of ascending responsibility, connections with many hundreds of capable people, impressive accomplishments, proven record of nowing how to campaign and WIN offices, a defensible record, high intelligence, and very solid judgment under pressure.
The person being promoted here might be wonderful some day, but gambling on unknown outsiders to somehow become great in office is dangerous. The House, Senate, White House, and administration is already drowning in people not really up to the quality this country needs.