Follow up with Kudos on Twitter if you don't get an email response; can't hurt. If they don't reply, though, they likely don't have any viable options.
He hasn't missed out on pilot season, as Asta indicated above; it's well underway, but there are a lot of shows still casting at the moment. Plus so many shows are launching at various points throughout the year these days, opportunities might still be available for a while yet. (Marvel has *four* series launching on Netflix over the next couple of years that all remain to be cast. I would give pretty much anything for them to cast Jamie as Daredevil, though I'm not betting the farm on it or anything. Heh.)
Of course, ideally I think as fans we'd all love to see him in a lead role that offered as rich a challenge for him as The Smoke did, but we probably shouldn't dismiss guest roles as "horrid", either. It would depend entirely on the role and the show; plenty of shows could offer juicy guest arcs that could run a few episodes or even a whole season. He's definitely done some guest shots in the past that weren't all that challenging to what he's capable of as an actor (He was delightful in Body of Proof, but mostly that required him to be beautiful and charming. Which he can do in his sleep, blindfolded ;) ). But he's done some really interesting ones too.