Another downgrade then...
Rosset has always been 60mph unless you mean it isn't increasing to 75mph. To be fair it would not make much difference as most units would never maintain 75 up Gresford bank, most of them can't even maintain 60mph. On average a 3 car 175 at full power will, a 2 car 175 will if it is a good one, 1 out of 10 158's will but I have never had a 150 that does. By the time you get to the A583 bridge an average 158 will be chugging at about 57 and a 150 at around 54mph. From 75mph most units would be well below this.
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I quite agree with you.
We saw 2+5 HSTs briefly on Virgin XC before Voyagers took over completely.
Even they would be too big for Wales & Borders, and any fewer coaches makes the trains unaffordable in power car maintenance terms.
Class 68+Mk3+DVT might work but still a lumbering over-size unit with high access charges.
If HSTs go to Scotland (Glasgow-Aberdeen/Inverness) maybe their Class 170s would be freed up for W&B.
170's are reasonable units if they are in par with the 168's but a 175 will leave it behind on acceleration. I think the 172's if they are available would be a much better option with the vestibule connectors intact as longer formations can be easily managed by the guards.