You didn't mean:
Would I download a 5GB or even a 100MB file via dialup?
That would seem to make more sense. Even though there aren't many 5GB downloads around. ;)
I've done it many times, even with CD images quite a bit larger than your
100MB. What's usable is a matter of personal opinion and requirements. 100MB can be downloaded over ISDN in less than 2 hours, and over dialup overnight. That's good enough for me most of the time.Of course. We can hypothesize all sort of special conditions that might dictate one service or another. But you made a flat statement, which presumably applies to the general proposition, not just special conditions.
I suggest you take your own advice. Your original flat statement had no parameters.
Of course not. But that doesn't keep sailing from being a viable option for a trip of that length given some other parameter.