I'm trying to be technical here and multi quote - please bear with me if it goes wrong!
I'm not saying Air Canada shouldn't be at Manchester, just trying to get my head round why they would switch from Rouge to mainline.
Fair enough, in general terms I think full service carriers models can be treated as an identikit to one another. Not all are premium heavy, but they do require a minimum level of demand and a sufficiently large and affluent market for a good economy product.
My point about leisure was more about what each airline offers. Yes people travelling for business travel economy, however generally, they will still expect a better level of service, whilst someone travelling economy for leisure would be more prepared to forego 'features' such as meals, seat allocation, etc. for a cheaper ticket - although its often been commented on here how 'expensive' Rouge can be.
I think these are fair points. What I would argue is that MAN (and the UK in general) has a solid demand for good quality economy service (and the ability to pay for it).
Some of the prices I've seen for Rouge when compared to VS, SQ, CX are extraordinary - more so when you see what you get for that.
I'm not sure about your point regarding onward connections at YYZ. Travelling Rouge you would still have the same access to the same network as if you were travelling mainline. Equally a longer season and more frequent flights could be provided by Rouge.
The point is that YYZ is geographically close to ORD and PHL (for AA), JFK (for VS/DL) and EWR (for UA) and arguably competes for the same connecting traffic.
However, given that the prices are in the same ballpark for Rouge (compared with AA, VS/DL &a UA above) I'd say almost all passengers would choose to fly with a full service airline (This may be different if travelling to YYZ).
Therefore, the theory goes that, in addition to MAN-YYZ O&D, AC could also capture more connecting traffic ex MAN (if it wants to of course) by going mainline.
I think your last point sums it up though - why would AC send mainline to Manchester instead of a currently unserved destination when Manchester is already served by AC (Rouge). I think the most likely scenario would be if AC want to serve Vancouver from Manchester - switch Rouge to Vancouver and 'upgrade' Toronto to mainline. That's now the situation at Dublin (an airport that in some respects can be considered on a level par with Manchester).
Yes. If YYZ-MAN can be upgraded to mainline, it frees up Rouge to serve somewhere else from YYZ.
The scenario you suggest above seems like a realistic "next step" but I don't know how realistic this is.
I think what happens with Air Canada at Manchester will highly depend on what happens with WestJet. The latter have plans to introduce a low cost subsidiary. If this low cost airline comes to Manchester, it is likely Rouge will stick around. If instead WestJet comes to Manchester, perhaps AC mainline will return. If WestJet doesn't make an appearance at Manchester, what incentive will AC have to expand/improve?
Don't forget TCX. They aren't likely to look at YVR due to their operation at SEA. YYZ might be a different story in the next few years.
TS are (I think) replacing the A310s with A321LR, so this might put pressure on AC.
Of course, this pressure might drive them away from MAN completely (you just don't know!)