Final answer:
The provided reference information does not align with the student's question about the adoption of the 7-Eleven "Konbini and mobile" system in the United States and instead relates to a natural gas conglomerate's market position.
Step-by-step explanation:
The question concerns the potential adoption of the 7-Eleven "Konbini and mobile" system in the United States. However, the provided reference information focuses on the merger of Kinder Morgan and whether it will result in cost savings for consumers or if it will create a strong oligopoly position in the natural gas marketplace. It seems that there is a mismatch between the student's question about a convenience store system and the reference about a natural gas conglomerate's market power. Therefore, it is not possible to provide a conclusive answer to the student's question using the provided information.