The whole station needs a rebuild as the current situation is completely inadequate.
In answer to another point. Four tracking this line is just not possible. There are four tracks beyond Kings Norton where the Camp Hill Line joins the Birmingham West Suburban which does give four tracks from the city centre to the south west which is why the upgrade to the Camp Hill line is in the pipeline with new stations on that line having received planning approval.
I was one of the posters who pointed out that the massive new University station buildings will destroy all future plans to quadruple what is already a very busy line.
I based it on using Five Ways, one station nearer New Street & seeing a former 2 track solum between the existing 2 tracks & the canal.
I investigated further & several road bridges had empty arches for 2 more tracks.
The Scottish library vintage map showed one of these extra tracks & a disused double track tunnel running to the edge of New Street.
The map also showed the third track running all the way to the old station that University replaced.
So it is true that 3/4 tracks were possible at least northwards from University station until these huge track blocks were erected.
The route via Five Ways station looks much shorter than the route via Camp Hill which will involve busy conflicting junctions.
So I still think those massive commercial buildings have permanently destroyed an opportunity to increase capacity via the Five Ways route.