There are several options, and I think asking for a new line to a 4-track section north of stafford is probably asking too much.
Given that the government is not interested in resurrecting HS2 Phase 2, the project that is most likely to get funded is the one that costs the minimum to eliminate this bottleneck.
The way I see it the options are:
- An attempt to build HS2-2A as far as the crossing with the Stone-Colwich line
- Totally new alignment heading up towards Uttoxeter, then electrification to Stoke - possibly with a chord and electrification towards Derby
- Attempt to redesign Handsacre, rebuild Rugeley and deconflict Colwich.
1 is probably the easiest from a "planning" view, but is tainted by association with HS2
2 is intruiging to me but probably the most expensive option
3 might work out cheap or might turn into a total debacle (That the railway cannot afford politically), upgrades seem to go either way.