So RTT here are my feelings to you point work.
1. No getting rid of the W's. The new Metro will more then solve the problems you talk about and the W's actually keep 4,000 people a day off the roads because of their handy closeness to locals. The locals don't even notice the noise since the stations are surrounded by greenery. I think that laverton bay could be built over (not apartments) without removing the trains as well.
2. a) Newtown station isn't anywhere near Parramatta road so I am not sure what you are getting at there.
b)Why are you demolishing all of the inner west stations for? They provide a great local service and if you demolish them it will only make road traffic worse. If inner west trains were all stations services and express trains actually used the suburbans instead of the locals then along with the tunnel from Strathfield to Lidcombe a fair chunk of additional capacity could be added.
c) What are you trying to achieve running a metro branch line to the main north line? I do not understand the purpose of this.
3. absolutely 160km/h running on the line from wolli creek all the way glenfield.
4. a) yes. b) Yes along with a whole new connection into central terminal to allow speedier ins and outs for nsw trainlink services to the main south.
5,6 and 7. yes
8. Quad to epping is a yes but the other part is not advisable because central coast services terminate at Sydney terminal and northern line services cross the bridge. Hence why there is a flyover at Strathfield for suburban services. This is one of the reasons of the slow travel time
9. Already occurs but the suburban services have to switch across at either homebush or macdonaldtown.
10. Those crossovers are of extreme importance because the western line is also used for freight outside of peak hours. A freight train breakdown is why those points are needed and why you can't have a 160km/h train on a line where a freight train could be doing only 80km/h.
11. Already happening
12. I'm not sure about that one.
St Leonards and Nth Sydney are 2.3km apart with the rail distance about 3.6km but made a painfully slow trip due to the tight bends adding at least 5min to the trip (I've broken it down once before, not doing again, I think the time saving is more). The two W's on a peninsula ridge for a small population, the bulk of the 2500 users per AM peak would be from east side. A new station in or near the inner eastern curve between the wo W's would serve the bulk of the users with similar walk up time, only a minority who probably don't use it anyway would be disadvantaged. However nearly 20,000 people an hour would benefit from a reduced trip time, Sydney trains would be able to release at least 1 set due to faster turn around time on the return trip and significantly lower track maintenance and train wear and tear costs.
Noise is a train wheel squeal significant, station platform announcements and train horns are a ongoing issue in the area, just google it and don't give me the locals don't notice it rubbish.
The former ROW could be converted to a green corridor rail trial from St Leonards to Lavender Bay with the former station locations partly developed for residential use to help cover the cost.
I would use either the old tunnels nth Nth Sydney station and/or build a new storage facility at St Leonards. Both easier to use over the current Lanvender Bay.
2) Move Newtown closer to the Parramatta Road, not cross it. Stanmore would also need to be moved north. Currently there are three lightly used stations within 500m of each other, MacdonaldTown, Eskinville and Newtown, meanwhile there is a campus with 40,000 students, major hospital and a large area closer to central than Newtown station on other side of Paramatta Road.
Read my post again, demolish the surface and replace with underground local Metro. Enabes the western corridor to be used for longer haul suburbans running at higher speed express. Enables the south pair of tracks to be increased from 4/hr for SW services to 12t/hr based on capacity in the city tunnels.
The western and Inner West Metro would be one common line to Uni/hospital/Newtown area, then seperate with inner west on southern part of corridor and Parramatta Metro running further north where the new to rail catchment resides.
3. Between Glenfiled and East Hills I'm not sure you need 4 tracks, I think i mistakenly indicated as such. Just 160km/hr
8. Yes, a bit of a mix, maybe not right solution. At some point they need to cross over.