We need Eric Hosmer's bat in interleague, but is that the only reason the second coming should expand his ministry to Right Field?
The simple reason why Hosmer should learn Right Field is that we need his bat - a at that we hope isn't so weak next year - in the lineup during the extended interleague, but that isn't the only motive that makes the decision to teach him right field a prudent one.
One reason to move Hosmer to the outfield would to provide versatility. If Hosmer can play right Field then that gives Billy Butler somewhere to play in the field - something he wants to do if I remember correctly. Also if Country Breakfast isn't occupying the DH role then we can get Wil Myers - or whomever is occupying the nine position - half-days off, something that might be helpful for a rookie. We could even rest Salvador Perez's knees while keeping his potent bat in the lineup.
Versatility also would be helpful in the case of injury. Say Myers gets hurt and we have gotten rid of Frenchy - one can dream - we need someone to play right field on an everyday basis. I don't know how much you trust Jarrod Dyson - or David Lough for that matter - to play everyday, but I would rather have the Wizard of Hoz's bat than Dyson's.
(Yes I realize that someone else's bat would have to be in the DH role if Butler was put in the field. Could Perez become the DH as Pina - or whomever the backup catcher is - plays in the field.)
Another possible reason for teaching Hosmer Right Field would be to hold down the fort for the first month of the season while Myers tears up the Nebraska plains. Bringing up Myers at the beginning of the season seems to be a foolish waste of a valuable resource - of course this means the Royals have to do it. During the service-clock-gaming April doesn't running sending Hosmer to save Right Field from its sinful ways seem better than have the smiling sinkhole occupying a lineup slot everyday?
Could Hosmer even play right field? At first glance he seems athletic enough and if I remember correctly he threw 95 of the mound in High School, therefore the idea of the begotten son roaming the outfield doesn't seem farfetched. While there may be a better option, the Son or Hos could be a cheap in-house option not only to add versatility, but also command the right field until Wil finally graces us with his presence.