Interested to see how this turns out. You have to assume BDB is really happy where he is, enjoying surely the best season of his entire career. From a purely footballing perspective, it's got to be hard to give that up for a relegation battle and possible Championship football next year. I could imagine Albion being tempted by the fee - but at the same time, BDB has proved a very versatile option and has a good few years in him yet. I'd have thought - good though he is - Duffy is a more likely candidate to be deemed surplus to requirements.
The good thing is, Albion really can't lose. They either spank Newcastle for an outrageous amount or we keep a very decent player.
I'm sure he is really happy but this is also the last opportunity he will ever have to join his favorite club and make a shitload of money.