No one, let alone HRC is looking at who is first or last on their current bike, because it’s all terrible. They have miles to go before speed is a criterion for rider selection.
As for the sponsors, they have already fallen wayside. If they do convince new ones to sign on for next year, rider quality won’t be what they’ll be pitching.
With the Desmocedici, Marini has delivered acceptable, if not good results (Albeit outclassed by other Ducati riders). The year that A. Márquez won the Moto2 championship, Marini was more dominant and was on track to win the championship, until an ill timed injury derailed his momentum.
For what he brings to the table, he’s a perfectly serviceable rider for HRC. And I do admire his decision to strike out on his own instead of taking the easy way out and ride for his brother’s team all his career.