It is a speculative idea so this isn't the place to discuss it but I think the answer is no because of a) the ban on Mk 3 derived EMUs through Oxted tunnel and b) performance on the route out of London Bridge.With 769s now starting to be delivered to TfW and GWR, could this provide a replacement for the 171 stock which is due to move to EMR ?
This has been raised before. https://www.railforums.co.uk/threads/class-769s-for-southern.190250/#post-4178171
This (informed) post is also relevant https://www.railforums.co.uk/thread...idlands-franchise.180920/page-31#post-4082078