For me it depends on Hayward. If he doesn't look like he is going to be near his Utah days, I'd probably make the trade. Walker and Westbrook would be impossible for other teams to defend. Weak defensively, sure, but offense is far more valuable these days then offense is. You still have Smart for guard defense when needed and of course have Tatum. I'd probably try to get Patterson back to add some big man depth.
So, if, and only if, I didn't like how Hayward was progressing I'd do this.
Guards - Westbrook, Walker, Smart, Edwards, Wanamaker
Wings/Swings - Tatum, Patterson, Langford, Semi
Bigs - Kanter, Poirier, Theis, Williams, Williams
That team strikes me as having a much better title shot than the one without making the trade if Hayward is no where near his Utah days (which again was the premise under which I'd make the trade).