It's a bit odd - it's been a disappointing season again for Saints and you'd say on the face of it that Wellens hasn't managed to get the best out of his squad. But looking at the quality of players at his disposal, a narrow semi-final defeat is pretty much the best that anyone could have achieved with that lot (especially the complete absence of a quality half back).
I don't suppose we'll ever find out if he's capable of being a great coach, but we've seen plenty evidence that he's a thoroughly good bloke, and I hope things work out for him in future.