Yes, they will still be free to choose their operator. Wherever a shared network is deployed, both Wyre and Fiberklaar will guarantee open access to the network. This means that, among others, Proximus, Orange and Telenet will be available everywhere. The choice of operator is therefore completely independent of the party deploying the network.
Where the HFC network is upgraded, all operators will also continue to have access to the network. Where a dual network is deployed, the choice of operator will depend on the party that has already deployed its network.