I think he'll always be in the mix somehow but he's never gonna be "THE man"... the thing about WWF/E and "big guys" is that they always get the push but they're rarely ever the main focus or the champion for any long period of time. You can go all the way back to Andre, Big John Studd, Bundy, Undertaker, Sid, Kane, Big Show, etc... the only exceptions would be Hogan, Batista, Brock but they're not "giants". Even when they gave the ball to Diesel, HBK's push was being emphasized while Diesel was puttin' on dud main events with everyone except Bret..
So Strowman will be a big guy that will always find himself in a relevant feud here and there, but I don't think it was ever gonna be him as #1 in the company no matter what.