No, Sandow couldn't carry the weight of the storyline's payoff. You're discussing the situation from an idealistic perspective like "if they had just kept it going, it would have worked," but it wouldn't. His work is really soft and "going through the motions." He wouldn't have continued the connection with the crowd that he had. He lost it all that one Raw where he came out and cut a promo to thank the fans, and it fell flat with the crowd because he just doesn't want it that bad (or doesn't know how to).
WWE fucks up most of their own storylines for sure, but Sandow is just not good enough. His shit Macho Man made it even more obvious.