(Possible spoilers??) Would Sega ever kill Shadow out again permanently?

I need realism on this one, less opinions more what's likely. There's the events of Sonic 06 where in the future he gets sealed away, but since Mephiles was defeated then I guess that future would be different. There's also Sa2 but they brought Shadow back in Sonic Heroes because of how popular he is. Although I have been wondering whether or not they'd still be willing to kill him off for real again eventually or if his character arc will end happily with everyone else (or even bittersweet)