"Fine Malvern doesn't deserve a subway because anywhere east of McCowan is eternal wilderness."
I don't think Malvern deserves two subways because it is a relatively isolated community that will top out at about 75,000 people, surrounded by a huge untouchable park. If miketoronto's bus ideas were implemented there along with some GO projects, no one from Malvern would be complaining and no one would suggest building rapid transit there.
"If the Sheppard line dead ends in STC you're destroying any chance of future planners to come along and expand where they see fit."
Who says it has to dead end there? It can easily be continued east to Markham & Ellesmere, to UTSC, etc. Doesn't mean it should, but it could. The Danforth line could easily be run up McCowan instead - there's more people there than Malvern, a lot more when you add in the Denison area, Markville, etc.
"Malvern in of itself may not be worthy but looking at the big picture its geographical location makes it a gateway to Toronto. A regional terminal: routes from Markham, Pickering, Uxbridge, a link to the PROPOSED Pickering Airport which will be built within 30 years,etc."
I'm sorry, Malvern is only a gateway for raccoons. Only a small percentage of Markhamites live east of Markham and since there's few roads that connect Markham and Malvern, getting to this subway won't be easy. A Stouffville line improvement would be easier, cheaper, and better for Markham. Getting from Pickering to Malvern might be even harder, not to mention farther. Uxbridge? C'mon, the entire population of Uxbridge could be housed in STC condos within 3 years. The airport may never be built - it's not a factor.
"People see the reasoning in bringing the subway to Vaughan, Richmond Hill and Mississauga yet the slightest mention of serving east Scarborough or Durham and everyone's shrieking at me."
A subway to Scarborough Town Centre is already taking the Danforth line out as equivalently far as the Yonge line to Hwy 7, the Bloor line to Tomken & Dundas, or the Spadina line to Jane just below Hwy 7. Just because it's in the 416 doesn't mean east Scarborough deserves whatever the rest of the city gets. A line must be drawn in the sand somewhere, and Scarborough Town Centre is as good a place as any to do so.
"It's not rocket science to link both lines at Sheppard-Markham."
Figuring out why you would link two lines there
is rocket science - you're not supporting the STC node and not even serving the bulk of Malvern if you do that.
I'm waiting patiently for your map