I do like that Oda gave Shanks a reason to be at Wano that wasnt superficial. I understand he and BB have beef, that shit probably will go down. But i also believe it cant go down without Luffy being involved (i.e. 3 way battle), or their fight will be simply a skirmish.
Theres no fundamental way that Oda draws a RHP vs BBP war with 10+ captains each side and have Blackbeard come out winning each fight, let alone onscreen. After this chapter that idea should have been dead and gone. Theres also the pure fact thar Luffy has way too much going on with both for either to lose before they see Luffy.
I do hope its a 3 way battle, but I wont be upset if both get their separate focus with Luffy at different times.