There aren't any big clubs where Mirko will be a regular starter. He starts only in Juve because we have the worst attack of all the big clubs in Europe. The only way for him to be a starter and still get big wages is if he's bought by some team in England, outside the English top 4. Or maybe somewhere in Turkey, Russia or Ukraine.
It will depend on the offer we might get. I don't see any team paying a fair price for Vucinic (~15m eur) and I don't find it too logical to sell him for 8-10m eur, because he's worth to us more than that. But I can imagine Juve selling him. If we do buy a striker, apart from Llorente, we'll be forced to sell some strikers, and then we might consider every offer, just to get rid of a striker. Actually, I find it very possible that Juve will do "a Melo" with one or two of our strikers and sell them below their value. After that I can imagine hundreds of "Marotta can't sell" posts from Cron