Umm, it's not that the new U.S. pairs teams can't compete internationally. They were just unable to be selected for GP assignments outright and must rely on possible host assignments. It's the changed ruling from top 12 placement to top 10 placement at Worlds over the last three years that impacts them.
Kam/ O'Shea and Efimova/ Mitrofanov do fit into the top 10 category, so E/M have two GP spots. K/O are out and may be retiring, but haven't said. (K/O are scheduled to perform in a big pairs show in Japan, headlined by Miura/ Kihara, later this year).
Last year, Flores/Wang, K/O, E/M, Shin/Nagy, McBeath/ Parkman, and Chan/Howe all competed on the GP. Only E/M out of these six teams, are currently assigned to 2 GPs.
New pairings: Andrews/ Parkman, Shin/Howe, and McBeath/ Nagy, are split/ returning teams. All three would have benefited from the top 12 ruling, but not the new top ten rule. So, they will have to rely on getting one of the two SA host spots. I think that under the top 12 ruling, Shin/Howe might have gotten 2 GP spots, and the other two new teams, at least one each. They will all need Challenger events to get more competitions under their belts this season.