The Yankees are supposedly looking for starters because of all their injuries. Roark would probably be a good fit for them as they don't need long term solutions, just for this year. Now, frankly, I'd talk to Roark about extending him for a year at roughly the same salary and if he was amenable, I'd keep him.
But if he's looking for a longer term deal, then I'd talk to Yankees.
That puts us in a vulnerable position for a while, needing to depend on Sims (and days off), until the hopeful return of Wood, but given the low odds of a playoff spot at this time, I think it's a acceptable risk, IF we can get some worthwhile talent from Yankees.