I too have heard too that getting a pup can help. TBH we have never done it because it has aways seemed to us that the old dog who is left is quite happy being an "only" and getting the extra attention and fussing that is the prerogative of senior citizens. Until the current pair we always had weimaraners and didn't find them that hard although as we always had them, we had nothing to compare it to. Out current boys are weimaraner GSP cross, litter bros from an accidental mating between two very well bred dogs.
Have never had a basset, but friends who have one say that theirs is VERY stubborn and hard to train....but I would have said that about a wei lol and I am not convinced that they are particularly good at dog training. I do understand that they need their exercise too and that recall can be an issue.
I think on balance and from my own experience I wouldn't get a pup but others may think differently.