One thing this article didn't mention was the flexibility of it's modular package spaces. They can put anything from SAR packages to anti-sub to anti-air/anti-surface to forward deployment of marines combinations in these spaces. The big issues are going to be the capabilities of the packages, forward deployment to meet operational needs that change rapidly once they are deployed. There's a lot of logisitics involved, but logistics is one thing we do handle fairly well.
I've read some defense articles on these packages and they do look quite impressive and look like they'll meet the needs of the future far better than the current role-restricted combat vessels. They won't be as capable as an Arleigh Burke or Ticonderoga at anti-air, nor as effective as any of the DD/DDG/FFG combinations at ASW, or an LPD/LPH/LHD at marine force projection, but they will be able to accomplish initial actions or holding actions until the big boys arrive.