Yes, Liverpool will have a significant impactMetro West won't pull that many bodies off T1 Western services headed for the CBD, unless their destinations are outside of the CBD, perhaps with the exception of Wynyard. Even then, the difference in time is measured in just minutes, so if you already have a seat, why would you bother? I'm sure most commuters won't measure the time difference down to the last minute, when there are other considerations, such as the inconvenience of having to interchange, with no guarantee that you'll get a seat, when you already have one direct to your destination, even if it's marginally longer. More Western Line passengers get off at Parramatta than get on, so if you are already on the train, then you have more chance of picking up a seat than if you interchanged to the metro. There's still no confirmation of how the interchange strategy will actually work, having regard to the location of the Parramatta metro station in particular. They still haven't thought it through.
The Western Metro will also pull many bodies of the Western services, although I suspect many won't have a choice as the western line trains are curtailed slightly to make room for others.
Schofields, less so as the numbers are clearly less. Assume that most using would be from Blacktown to Richmond headed to the north side, potentially even as far as North Sydney, the Metro will be faster and yes getting on from the start they get a seat. As the Y-link service connects would connect with the Metro, maybe others further south of Bankstown may seen this as a better route to the North side, but numbers obviously small.
It just seems the govt, past and present seem to have zero interest in connecting the north side of the network with the west, ie EPRL and now Metro to Schofields.
It would be faster from Blacktown to North Sydney or even Chatswood for that matter via T1 than having to backtrack to Schofields to catch the metro (assuming its extension to the CBD). Why bother?
I agree that governments of both persuasions have been negligent in planning for connecting Northern Sydney with Western Sydney, by both road and rail. The PERL should have been completed as part of the original Parramatta to Chatswood Rail Link and it was the lack of foresight on the part of then Transport Minister Michael Costa that prevented it from happening. Had it been completed, then the North West metro may not have confiscated the Epping to Chatswood Rail Link for metro conversion and instead followed a completely separate path to the CBD, without compromising existing Sydney Trains' services.
With regard to road connections between the regions, the Eastwood County Road corridor, which has been reserved for close to 70 years, has been neglected, when it would provide a high standard arterial road link between Macquarie Park and Parramatta via Kissing Point Rd and Bankstown via Silverwater Rd.