Its exactly that, in the future should the GTVA focus on the production of an all around fighter? I mean, one that can handle other fighters and have some firepower enough to be threat to larger ships, the obvious example being the Myrmidon. Taking into consideration that the shivans strike with an incredible advantage in numbers (both small and larger craft), a fighter that could handle multiple roles like that would be the best option (in most cases, at least), in the same mission it could engage fighters and larger ships avoiding the necessity to field heavier bombers (or even assist them in their job), wich are easy prey for fighters.
Another idea, should the GTVA do something in the same way of the current F-35? Building three ships with common systems would be a good advantage to have both in logistics and weapons compability. Of course in the case of the GTVA, it could be a interceptor, a all around fighter and a bomber, all of them sharing the same basic components and, to a lesser extent, even the same structure.