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AFAIK the light gathering and theoritical resolution won't change. A longer fl will allow you to use a smaller secondary which will improve contrast but that will only be detectable if the original obstruction was >20%. You will of course get a higher magnification for a given eyepiece but with a scope that small you will hit the upper mag limit pretty quickly. The very big downside I see is that a 2m tube is difficult to transport, move and, with a small diameter, keep rigid (trust me, I've had a scope that long).
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