From the article Raditsu posted.
"In further testing to determine if the new bacteria were different enough to qualify as a new species, Lenski’s researchers found that beyond changes to the genes responsible for glucose and citrate consumption, other changes had occurred in the organism that had made it less fit to survive in a glucose-only environment,
“We find they are getting less fit in the ancestral niche over time,” Lenski said. “I would argue that citrate users are — or are becoming — a new species.”
So if these bacteria were not moved to a citrate rich environment, wouldn't they just die of in a few more generations?
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