I guess it's another case of "never say never". I think the contract info brought up earlier in the thread shows the intent to at least support these weapons into WW2.
They were just ordered stored against possible future need in 1926. LoC entry A1635, which was part of the standardisation of small arms and accoutrements, states several rifles including the MkI series were "Omitted from Vocabulary" (meaning their name was not changed to No1 rifle) "But retained in store for possible future requirements" I suppose WW2 qualified as a "future requirement".