Google is reported testing a new search results feature that shows the "approximate number of words next to certain search results."
The word count is usually displayed for articles, but only for a small number of results. You'll probably think twice before clicking on a search result that has 50,000 words, unless you're looking for an in-depth report.
Who knows, Google may also add an advanced search feature that lets you restrict the search results to short articles or long documents.
A summarization feature would also be helpful.