Crimes against animals are despicable and it's very difficult to move on. Sentencing laws need to be changed to increase the penalty for these heinous crimes, that being said. He did serve his time in Federal prison and should be able to pursue his chosen profession, which is football.
Make no mistake the NFL is a business. If you feel strongly about Michael Vick, don't buy Philadelphia eagles tickets, merchandise etc. I know I will never be a Michael Vick fan.... Or an eagles fan for that matter. But I do think he can spend the next 40 years trying to make up for his crimes... It's up to him what he does with this chance.