This country is fascinated with revolutionary change as the solution to everything. Maybe it's the short attention spans or possibly just a lack of patience that drives it, but quick fix revolutionary change doesn't happen very frequently.
The alternative is incremental change. You make small steps towards your goal and let people get used to the new "normal" so that you can push a little further. This often culminates with a very large change in the end (ie: the slippery slope). This is far easier to accomplish than revolutionary change and can ultimately take less time.
I know I frequently sound like a conservative when I'm faced with my revolutionary brethren on the Left, but this is exactly my outlook: I'd rather accomplish discrete goals than tilt at windmills and ultimately harm the long-term goal more than I advance it. I'd also like to compel my intellectual allies to follow the same course.
This comment came out of a criticism that said that gay marriage shouldn't be a goal because it only helps rich white people-- that is, if you have no assets to pass on as inheritance, you have no health insurance, you have no money to pay in alimony, you have no established homestead or stable child-rearing environment, then it doesn't really matter whether you can marry or not. This... is retarded. I recognize that one of the luxuries of privilege is being able to segment and solve your problems-- the system is in your favor, so whatever problems exist, they're not systemic. Nonetheless, the non-privileged benefit from this too, because the structure of our socio-economic system and its unfair prejudice against disempowered groups is a series of problems, and solving one does concretely advance a revolutionary goal. Revolutionary structural change can only follow revolutionary paradigm shifts in the zeitgeist, which only occur with incremental changes that underline a new ethic or philosophy.
But this also gets into the psychology of revolution, and one of the things I hate to face is that most activism is not sincere, it's temperamental. People aren't revolutionaries because they're reasoned out that revolution is the only way to accomplish real change; people are revolutionaries because they're assholes.