I have never liked Jackson very much, but I realize that he does provide value in his durability. With that said, he certainly isn't going to make or break the Cubs' future. By the time they are ready to compete, he will be nearing the end of his contract. Best case scenario, he is pitching well in a few years and becomes a good value piece that can either be held onto or dealt. Worst case scenario, he just won't be re-signed and will free up some money to sign someone else in 4 years.