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I'm not sure what you mean.
It's not that a "late answer" is "invisible", it's just hard to notice. Answering a question does push it to the top of the pile again at the homepage. The original asker will also get a notification next time they log in.
But generally, yes, it is a weakness of the Stackexchange software that later answers don't receive much attention. This is in part of result of design decisions made for Stackoverflow --- there's a much great sense that for programming questions prompt and early answers are more useful than later ones.
I'm having trouble imagining a mechanism to make later answers more visible, though. "Paying" the server some of your reputation, to keep the question high on the front page, until it's received a certain number of views???
One thought I came up with is for an original asker to include a short summary of the answers into the questions. This should work when the answers complement each other; it also would make clear what parts of the question are still unanswered.
The disadvantage of the proposal is that it requires manual work from an asker or a 2k+ person and it may not work for all types of questions.
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