It will be due to getting Talib back and our secondary settling in. I don't think the run defense is going to improve without improvements to this roster, but with this offense IF they can fix the sieve that's been going on vs the pass then yeah they're very capable of running the table.
After the season we need help on defense at every level. They need to snap up an impact addition there bottom of the first round, and hopefully from there get at least one more potential starter who can add some competition.