Yes! This is exactly how I think about my comics. I want to write something that will stand the test of time. I don't care that much for short term engagement; it's how people react when my story is finished and people can see the whole picture that matters to me. Rome was not built in a day.
So I want to really take my time and make the foundations of my work as solid as possible, even if it means there's not much to see here yet and people get tired of waiting and following; they can come back in 10 years ^^;
And yeah, I do have multimedia franchise plans for my comic. I'm less interested in getting a big company to pick it up though ^^; I kind of agree with @Takaki03 that it's very unlikely for many of us to catch their attention, but I don't see that as reason to give up on getting your comic animated altogether. I think there are other ways to do this ...
My plan is to finish my comic bitwam, then start a 'public anime project' where anyone can come in and animate/voice 'cuts' of the comic (which is basically already in storyboard format), or pitch in some money into a 'tip jar' which will be used to hire said animators/voice actors as they come.
That's a model for making big projects like games or animation I wanna try out if my stories manages to rally enough supporters. I wanna see how much we can accomplish just as a bunch of random people who really wants something to happen. I anticipate it'll take way longer than a professional anime and the quality will probably be all over the place, but I think it'll be really cool 
(Also the sequel to bitwam is a visual novel, so I guess technically another medium :P)