Exile's rech is the tutorial, not the entire levelling.
All a potential revamp would need to skip is the old tutorial areas. Northshire abbey and whatever the other introductory areas were.
Exile's reach is 1-10, and while BfA is perfectly serviceable as 10-50 it was not designed to be, and should not be considered evergreen content in that regard. And if we assume Blizzard wants to continue giving new players a springboard that places all players in an even playing field like what they said they wanted when they made BfA the canon 10-50 with Chromie time being for experienced players only I believe we can conclusively state that SL does not work nearly as well for new players as a 10-50 levelling continent.

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