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I think practically speaking there is a workable limit to the size of a scope for the amateur community.
My 17 inch would be my limit. The gains from larger aperture I think begin to diminish as seeing, light pollution, accuracy of tracking, mount capacity, wind conditions become more and more influential.
12 inch is probably the limit for practical portable imaging. Even then some 12 inch scopes are pretty large and heavy.
Above 12 inches you are really looking at a permanent mount as the weight factor alone makes it hard for one person to handle it safely.
A 1 metre scope would give "nice" blurry balls for stars in most people's seeing conditions.
Greg.
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