The combinations of factors make this unlikely:
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It’s a one-off feature. Meaning that you might use it once and then never again. Low value.
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There’s no reason to prioritize this above import from Todoist, or any other app, since the underlying data is similar in most todo apps. And Everdo is not trying to steal users of Nirvana or any specific app, so it’s unfair to only import from one app and not others.
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High effort of initial development and maintenance. We don’t control the data format of another app’s backups, so the feature can very easily break at any time.
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Few users need it, compared to many other features.
In case someone want’s to give it a try. The JSON format Everdo uses for import/export is simple and transparent (ask questions). It should be easy to write a program to map well-defined data to this format. Parsing another app’s data, on the other hand, can be difficult, but you can choose what to omit. That’s what I did when I migrated to Everdo.