An interesting topic of reading, my initial reaction was that if Railworks carries on for the next 10-15 years, ALL of the above routes hopefully would have been created by then, plus quite a few others as well...
What has already been criticised is the boringness of the various route lengths, unfortunately, although I would partially agree, as an ex-railwayman and having travelled to every county in England, Wales and Scotland, today's scene is a total change to what we had 30 - 40 years ago with the closure of so much of Britain's industrial railway heritage. Do we want routes set in today's standards, boring as they may be to some players, or decades ago, which would then require a whole new creation of stations, signal boxes, industries, etc, etc, for each area of the country.
I also think route creators are restricted a little with the textures available, I haven't seen a good rock-face or scree texture yet which would be obviously very necessary if building the West Highland Line for example, or white cliff textures, so, anything from Dover westwards would be equally as difficult, therefore, I think that certain other factors need to be addressed first before our wonderful route-builders attempt to recreate anything. As was also previously mentioned, I think it's a bit of a trade off between realism and the effective running of any layouts on people's computers, it will be interesting to see how Mully's route finishes up from Edinburgh to Glasgow and then north to Aberdeen and Inverness, that's a hell of a lot of square mileage to stretch our power hungry PC's over, and the thing that route creators sometimes forget about us end users is, that I personally have over 50 layouts on my PC from around the world, complete with all assets and over 450 locomotives and rolling stock items, nearly 60 gigs so far, accumulating more content with each download would seriously stretch some peeps resources.
For the record, I'd also like to see the recreation of the West Highland Line, in it's entirety, from Glasgow to Oban, Fort William, Mallaig and the Kyle of Lochalsh, complete with flower borders and hanging baskets on all the station platforms...
Cheerz. Transport Steve.