Even the LCS is a littorial vessel and is not something you would attempt to operate in the North Sea and North Atlantic (there is a reason for the Winter North Atlantic Load Line limit).
That would be counter to the Austal claim their Trimaran design offers "superior seakeeping" and "rough weather capabilities" normally not found in a 3000 ton warship. I'm not sure what that claim means though, in WWII most of the DEs in the North Atlantic were less than 1200 tons, and they got the job done.
I think it is something still to be determined, as are many, many aspects of the LCS project. I will not be surprised if it turns out to be effective in the North Sea and North Atlantic though, some of the original designers of the LCS concept were British with a lot of experience designing warships for that region, including the designers of the Sea Fighter.
Unfortunately, I am also not going to be surprised if the LCS ends up performing escort roles traditionally assigned to frigates. Given the coverage capabilities of the USAF in both the Atlantic and Pacific, the blue water threat in the 21st century is submarines, which is the only blue water role the LCS 'should' be able to support. Whether the LCS can support the role effectively also remains to be seen though.
However, I wasn't really thinking about the LCS when I mentioned streetfighter, rather I was thinking specifically of the "global corvette concept" riksavage mentioned, except with a twist.
Unlike the USNS, the RFA (and other European equivalents) tend to perform more traditional navy roles on their non combat ships. One potential long term twist is to utilize future RFA ships as motherships for smaller combat vessels. One modern example as a technology demonstrator would be the M80 Stiletto, which was built to be deployed via the well deck of an LPD or LSD.
A M80 Stiletto can deploy both UUVs and UAVs, and an LPD can carry and deploy a number of additional USVs, UAVs, and UUVs when storing the M80 Stiletto in the well deck. This type of mothership concept is at the beginning of experimentation, but the idea does appear to have some merit. After all, a Whidbey Island Class LSD could potentially deploy 5 M80 Stiletto's, and safely store an additional 30 USVs also in the well deck, not to mention dozens of UUVs below deck that could be deployed via side crane or well deck, and that still doesn't account for the top area which could be used as a flight deck, or all the cargo space that could be used for weapons displacements.
I'm not advocating an LSD Navy, rather pointing out how much you can get out of a non traditional platform if you think of non traditional ways to utilize them. The USNS Gunnery Sgt. Fred W. Stockham (T-AK 3017) is another example. While it was once a simple Maritime Prepositioning Ship, today it is basically a floating fortress for supporting SOF operations.
If you look at the doc I linked to above, it isn't the late 90s version of streetfighter, rather a developed version of a navy alternative fleet that was designed to give the US Congress options to the US Navy future fleet architecture. The US Navy released what is known as the 313-ship fleet, but the alternatives were interesting if simply for their creativity.