I am going to throw a view that is likely not to be popular so here goes.
Why does Haga deserve the ride (if it comes through)?
He has had opportunities and in all reality delivered very little in return. Yes he has some race wins and even high placings in the championship but he is yet to get a title despite having been in top flight teams.
In MotoGP we talk about riders overstaying their 'use by' dates because they are no longer producing results, where is the difference?
He may well be a nice guy, he may well be an entertaining racer and he may well be one of the most talented riders on the track (IMO), but he rarely delivers which (IMO again) makes him a potential bad investment for Ducati.
If this eventuates and he does not win a title then all will be clear that he just lacks in a vital area (which I feel with mental application/concentration).
Time will tell and I will likely be wrong as he has the talent, but I remain unconvinced that he is the 'right' person for the job.
Garry