As much of a dump as the current station is, and severely lacking in facilities - no one will invest in it to make it a nice place:
- Firstly - the Durham Coast line is woeful in terms of line speed for connecting 3 major cities in the North East (Newcastle, Sunderland, Middlesborough). Why use the train if it's quicker by car?
- Secondly - Sunderland city centre is on life support as it is - Yeah, there's the Vaux development, which is finally, after 20 years, actually getting some movement. However, outside of the Bridges and the high street, it's all Charity shops, discount stores, empty units and betting shops. Who's gonna put in the retail units to make a rebuild successful?
- Thirdly - There's no where to go from Sunderland Station - apart from stops along the Durham Coast line and the Tyne Valley to Carlisle (And the 4 or 5 trains by Grand Central), there's nowhere to go - Can't go to Shields, unless you go all the way to Heworth/Pelaw. Can't go to Liverpool or Manchester (That got stopped about 20 years ago). Can't go to Scotland. Can't go to Durham, Can't go to Darlington. Can't got to Washington. Can't go to Houghton. Even on the Metro, you're limited to Seaburn, the university campuses, Pallion and South Hylton. The station is essentially just a feeder for Newcastle.
- Fourthly - all the trains that stop there are crap - No one in their right mind would choose to travel on those things.
Loads of things need to happen to realistically see any change - such as Electrification of the Durham Coast line, and line speed increase to 100mph + (will never happen), Expansion of the Metro to incorporate more of Sunderland's suburbs (unlikely) or Increase in services from Sunderland to exotic places such as Darlington and Durham (will never happen).