nah
the whole reason odiddy created shamrock is because he wanted evil godking but did not want to make godking evil
godking will not die
Here's what I got from the clown brain mainframe (anyone remember the Mother Frame translation of Mother Flame? This series is guided by goofwads)
I think Teach wants to kill all of the Celestial Dragons, period, point blank, full genocide like the CDs want for the Davy Clan.
BUT, there are two main targets. Imu, obviously, and then Garling and his family. Hence the Shanks scar. Blackbeard has always been able to laugh off his ambitions and play the long game. But... just seeing Shanks' face was enough to set him off, and make Teach serious.
So, I think Blackbeard will kill Shanks (probably in an underhanded way), and then Shamrock will seek revenge against Teach, and, since Luffy will want the same, Shamrock and Luffy will have an uneasy alliance regarding stopping Blackbeard.
Luffy will be like "I'm going to defeat Imu... but, I realize Blackbeard can't rule, either. We can't let him take over. Fine... I'LL HELP YOU STOP TEACH, SHAMROCK! FOR SHANKS!!!"
I hope Blackbeard just beats and kills Shanks in a real 1v1, though. While I think Imu or another Demon is Final Villain, killing Shanks would really make Blackbeard a serious threat in this universe.