Think about it:
Barca have Busquets, de Jong in that position and a shit load of financial problems, so they'll be desperate to loan him out for even a portion of his salary, meaning we can get him on a decent salary like 3-4m. With foreign player rules thats MDS level salary gross and 0 transfer fee.
Unless theres some big injury problem we dont know about, Id be intrigued to see what he can muster up if given one last shot at top footie. Not all signings like this will work out the same as Pirlo in 2011, but the potential that it might combined with the low cost alone is worth it to me.