I practise in Queensland, so there may be some differences between the states.
Your right of way will not have been ‘sold’ or altered in any way so long as it is registered on title. The easement gives you a registered right to use the subject land for specified purposes - it does not give you any rights in the land itself.
Very (very) loosely, consider it like a lease of a house. You have the legal right to live there during the lease, but you have no right to stop the landlord selling the house.
That aside, how do you think it ‘essentially reduces the value of your land’?