"Many are unhappy with the quality of new canon films and novels, and have begged for their favourite old novels and characters - Shadows of the Empire, Thrawn, Mara Jade and so on - to be re-introduced into the official timeline. "

This would be very foolish and I think the ignorance of those people only becomes more and more evident with time. It’s better to leave those things alone and not do a much worse version of them. Like we’ve said in other threads I think the ideal, more realistic solution would be to let authors work within the Legends continuity if they want.