I will also miss Dirk, but I am a lousy shot
But seriously, I know Din only travelled with SB for a small tiime in Redemption and if I remember right left SB on the far side of a ravine swarming with orcs in the middle of a burning wood, while he ran off with your girlfriend, he does have a soft spot and would love to come along for the party.
I can see him finding out when sitting in some nameless inn in a barely known village when whispers in the wind and on the sweet tongues of birds tell of the death of smaugsbane. He would smile a sweet bitter smile, finish his drink, and start walking towards distant Dale.
(and Dale is North West of Rhun your Bardy, tsk, these humans and their geography....)