I think it would be cool to add the London bridge section to Brighton as it would complete the Brighton mainline. Alot of DTG routs are incomplete and I understand that's it's a lot to implement a whole route especially if it's really long EG: LGV, GWR etc. But the London bridge branch would really add to the Brighton mainline especially with the rush hour release as it's a really busy station and it will complete the route.
I would love this too, but I doubt we’ll see this. To date, DTG has never extended a route on TSW once it has been released.