Addition of more remote station locations with associated transporter roads, power and fiber connectivity is being considered as part of an ongoing development study. A fully working single baseline interferometer has now been successfully setup over 30km long communications fibers between AOS and OSF sites with different pairs of antennas 3 times during 2019, using existing ALMA hardware and only very minor software and firmware changes. Approximately a doubling in maximum baseline length (from 16 to 32km) is looking promising in the medium term. Such extended configurations are expected to utilise all ALMA antennas in a single array of ~60 antennas in order to maximise surface brightness sensitivity, image fidelity and calibrateability. A next generation correlator should be designed to cope efficiently with the delay tracking demands of such an extended array, and for future proofing perhaps even more. Given increasing sample rates too (perhaps 40Gs/s, compared to 4Gs/s now), the rate of delay updates to handle will be massively increased. Increasing baseline lengths also push for shorter integration durations to minimize uv-smearing, further increasing the output data rate budget when considering the increased bandwidth and channelisation. Given the success of the current DTS in operating over the communications fibers between AOS and OSF, the possibility and relative benefits of locating the correlator at the more accessible OSF site should also be considered.