Much as I'd be on board the 'Kane train' if it I happened, I can't help but think it will come at the cost of one of Mata or Herrera. If he joins it seems inevitable that Rooney will drop to the number 10, with Memephis left and hopefully Pedro right, LvG is always going to play two of Carrick, Schwienstegier, and Schneroderlin imo, so that leaves Herrera, Mata, and Fellaini twiddling their thumbs when everybody's fit, ok that's not very often but it'd still be overkill, and I doubt they'd be overly keen of doing that when LvG told them that's what's happening, which he will.
Personally think we're maybe better keeping Hernandez as a fall back, but give Wilson or Januzaj the number two striker position, this time last year Kane was a nobody and really bloomed, Wilson/Januzaj could do something similar giving the chance.