TfL should still take over or at least be given overarching control over services that run entirely or all but one stop inside Greater London. It's less about brand new rolling stock and first-to-last staffing and more a correction of attitude towards the role that those services... serve.
There should, without a shadow of irony, be a line that goes straight from where I live to where I work.

Greenwich council did once have a ridiculous proposal about putting the DLR on stilts towards Eltham, I can't remember if that would have come from Lewisham (for Greenwich town centre) or Woolwich. On the same self-centred note, Avanti should let their new bi-modes go to Barrow
Networkers are the best trains on the rail network simply because they're the best sounding stock, almost every other EMU produces boring/bland sounds.
Not only do they sound great but they are the best trains that run on Southeastern Metro compared to the 376 and the 707. Both have terrible internal layouts for sitting and standing (and you'll definitely end up standing) and no toilets matters when many of the stations don't have toilets either, or you're not exactly prepared to wait half an hour for another train.
Student railcards should be deleted.
If you mean the 16-25 and the 26-30 I disagree, it should go in the other way and there should be an adult railcard covering people aged 31 to 59.