On first reading of that article, I got the sense that the Torchwood characters we've seen thus far might be in the pilot and be recurring characters, not be the regular cast. On second reading, I realize it said, "... [get] John Barrowman to star," but I still read that as not "be the lead" as much as be a guest star in the pilot to get things rolling, ala McCoy in TNG, Picard in DS9, etc.
I'm not envisioning an American reboot either. This would make sense with an American/International-ish cast based out of America, maybe even with the full knowledge and cooperation of the US Government. Afterall, if a Lieutenant General in the US Army can usurp the UK Government on behalf of the President, anything can happen with Torchwood in the US!
Captain Jack and/or Gwen will get 'er going, and we might see him during Sweeps. Beyond that, it will be a new gang.
And, hopefully, there will be a UK Season 4. Then we get multiple Torchwoods.