Unfortunately, without further track amplification between Strathfield and the CBD, we're stuck with a mixed stopping pattern on T2 unless they convert it to a single all stops pattern. With the limited time savings for so called "semi-express" services, they might as well adopt the all stops pattern, increasing the potential frequency in the process.Yes, Inner West Metro is not a priority before at least 2030.
There's no point in converting the T2 Inner West Local to metro, which still has to connect with the City Circle, even if further track amplification allowed the longer distance T2 express services to be separated.
Increasing frequency to 24tph with the signalling upgrade will only be possible with a single pattern, whether all stops or express. I don't see any problem with 24tph when integrated with ATO, which will safely reduce headways and allow higher frequencies and average speeds. Limiting the frequency to 24tph, from potentially 30tph, makes allowance for any increase in dwell times for DD. A separate metro for the Inner West, building new underground stations isn't needed. An express tunnel for existing services without any intermediate stations would be of far greater value.
I can see your point about extending the metro from Bankstown to Regents Park to simplify interchange with Sydney Trains services and eliminate the Lidcombe shuttle service, but the government so far seems to be reluctant to branch the metro lines. If the direct extension to Liverpool from Bankstown isn't feasible, then extending to Regents Park is certainly worthy of consideration.
If you are building a Inner West Metro, you are not using the City Circle tunnels, rather that track capacity is made available to others, basically the whole point of the exercise.
You will never get 30t/h from the current train technology. Its only just viable with SD with 3 or 4 door, certainly not the Sydney DD's. Again pushing the current system above 20t/h as timetabled is just asking for poor reliability as the French have found. As I said before, its all good until you find that simply getting someone with a pram on and off the train causes a knock on effect that takes hours to correct and then wonder why your monthly ontime performance sucks.
The govt is reluctant to branch the metro for the right reasons in that you open up another can of worms. The current equivalent of this is called Sydney Trains. End to end point dedicated tracks is the way to go, however in some circumstances if done right I have no issue with a ----