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"remains theoretical" is correct and usable in written English
You can use it to refer to something that exists as an idea but not yet as a reality. For example: Although the potential benefits of this new type of energy source have been discussed for years, its actual implementation remains theoretical.
Exact(27)
The risk remains theoretical, Dr. Ferguson said, but it worries many public health experts.
Any NATO deployment remains theoretical until government leaders reach a peace agreement.
This threat remains theoretical and, if the latest polls are to be believed, unlikely.
The £2bn Osborne announced for flood defences is not new and the £1bn shale wealth fund remains theoretical, as no fracking has yet happened.
The idea is gargantuan, the visual scope of the devastation is enormous, the destruction is depicted in furious detail — yet the horror of that destruction remains theoretical, abstract, and implicit.
Many are equally enraptured by Apichatpong Weerasethakul's Cemetery of Splendour (New Wave, 12), though my admiration for this immaculately formed life-and-death reverie remains theoretical rather than rooted in the heart.
Similar(33)
The question remains somewhat theoretical.
Consumer demand for books to be read on screens remains largely theoretical.
Any identification with him (if identification is quite the word) remains contemplative, theoretical.
Most observers say a death sentence is very likely, though life imprisonment remains a theoretical possibility.
The argument that the border must be secured because of the threat of terrorism remains largely theoretical.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com