I dont think he's likely to reform much, no.... but I dont think that EVERYTHING he does is activated entirely by bad motives, such as his rush to see Marianne. Like most people his motvives are mixed...I think that he had a "romantic" idea of rushing ot her deathbed....And he hoped that by making the romantic dash, he would be forgiven by her and her family.. so it was partly a selfish motive... but in essence I think that he did have feelings for her and he was shocked and upset at her possible death and wanted to see her out of genuine emotion....
I think that he was aware of his marriage being unlikely to produce happiness.. but possibly HAD he been able to marry marianne, he woudl nto have been a bad husband... I think that like Henry C wiht Fanny, he truly regretted her loss...
I agree he hasn't many good points... but Marianne loves him... Why? becuase he's an entertaining companion? so do ELinor nad Mrs Dashwood, but they know no positive good of him excpet for his carrying Marianne home when she sprained her ankle and that he admired hte cottage....