There is no substance in your post, just paranoia and personal comments.
Paranoia 1 - there are no rules you speak of. You just made it up.
Paranoia 2 - Factually you are incorrect. There are significant plans, which anyone can see, to invest north of the Forth.
Paranoia 3 - Anyone who raises the prospect of spending billions of money on HS2 instead of railways in the Highlands, such are your good self, will "ban" it. HS2 can't be "banned" by a political party.
Wow!
Where would you spend the billions from Scotland going on HS2 if you could do so north of the Forth instead?
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Agreed and my profile name is more tongue in cheek. Factually Highlander is incorrect as you point out but the level of paranoia that now exists requires a dogmatic argument to be dusted off periodically.
I reckon the 158s are pretty poor now.
Once the wires hit Stirling, it would make sense to continue to Perth and Dundee.
Anyone know which presents the bigger challenges for electrification? Stirling to Perth or Inverkeithing to Dundee?
The easier route by far is Dunblane to Perth, but will need resignalled as it's still semaphore signalled in areas.
It's not a complicated route to resignal or to electrify, from Dunblane north, there's very few overbridges, there's only a couple of sidings and crossovers, and there's only one junction (Hilton Junction) for the route to Ladybank.
Moncrieff Tunnel would be a concern, it might need a track lower, but I've a feeling it would be OK with a rigid overhead conductor solution, I'm fairly certain the last couple of bridges in Perth - Edinburgh Road and St Leonard's Bridge will need lifted. The station itself is fine, but in an idea world, would be completely obliterated and started again from scratch. Perth deserves better than the asbestos and tin cow shed it's stuck with now.
The route from Inverkeithing to Dundee is more complicated, it too needs resignalling in places as we've still got semaphores in use on the route. It's got a number of more complicated junctions, for the Fife Circle at Inverkeithing and Thornton, there's the junction to Perth at Ladybank and you've got Dundee Central Jn once you're over the bridge.
The tunnels at North Queensferry, Inverkeithing and Kinghorn will almost certainly need lowered or rebuilt and you'll have more bridge re-building works to complete, as the line runs through more populated areas.
The other side of the Fife Circle we will assume is being electrified at the same time, it's more straightforward with more bridge replacement/track lowering work, but nothing as complicated as the tunnels to worry about (I'm saying all those before survey and gauging work has been done though).
We will need decisions on passenger services from Edinburgh to Alloa via Charlestown Jn (converting the Longannet goods line to passenger use and electrifying the route) and the Methil branch (re-opening and electrification) to decide on appropriate feeding arrangements. If the route from Stirling to Charlestown Jn is electrified, I'd expect the existing grid access point at Longannet might be usable as a feeder. The route to Methil could be re-opened with an interest in using it for freight, so the route would need to cope with electric locomotives in addition to just one or maybe two EMUs at a time.
Past Thornton, the route is fairly straight forward - the only issue you might have is choosing whether to electrify the fuel depot at Linkswood, assuming it's going to remain available for use in the future. Then you're onto the Forth Bridge, which we would assume will be electrified with a variant of the rigid overhead conductor system to remove the need for tensioning and catenary wire height. I don't see either the Tay or Forth Bridges causing excessive problems for electrification, but the tunnels just north of the Forth Bridge would be my immediate concern.
I'd expect another Winchburgh type operation if they need lowered, with some services using the west side of the Fife Circle and more Aberdeen services being diverted via Stirling and Perth onto Dundee, but that's just off the top of my head. I've no prior knowledge of whether things have been looked at or plans drawn up as yet, beyond very basic costings and confirmation nothing is absolutely impossible.