Should the new requirement be competed only among 8a firms?
That is a judgment call for the contracting officer. FAC 2005-50 made it clear the contracting officer has full discretion to decide which socio-economic tool to use, and how to use it. While CICA mandates "maximum practicable competition", it also has an exception for other than full and open competition when a non-competitive action is otherwise authorized by law, which an award to an ANC is. GAO has also stated it will not accept protests of sole source awards to ANCs.
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Bottom line: Do what is best for the customer and taxpayer, while also considering delivery schedule requirements and available resources.