We'd far from screwed, we're already missing Rooney and we're getting along just fine. Take Welbeck away and we'd still have loads of options. VP/Rooney, VP/Hernandez, VP/Kagawa, Rooney/Hernandez, Rooney/Kagawa, Hernandez/Kagawa, or Rooney, VP or Hernandez upfront alone. It'd take a hell of an injury crisis for Welbeck to be needed.
I hope it's true, all Welbeck's really done this season is keep better players out of the team, the other strikers are all better than him, he's makes Downing look like Messi when he plays on the wing and it'll be an awful lot better for his development to be playing upfront consistently.