If it has not dropped in the mainstream English, don't you think there is a reason?
For humans to understand a language, figuring out its grammatical structure is very important. Perhaps Japanese/Korean style of language shows this point more clearly: they have suffixes to indicate the functions of a term.
English is a positional language. And at some point in its history, things simplified a lot. Worse, noun can freely become verbs in English. (E.g.: "color" could be noun and verb. Even typical noun words like "sky" can become verbs in some dialects. See:
http://www.azlyrics.com/lyrics/solangeknowles/skyaway.html )
Nouns became heavily overloaded with verbs. Because English is a positional language, the order of words (plus the usage of prepositions, articles, etc.) usually offers clue as to the grammatical function of the words. For all other persons in English (except 3rd person singular), to use a verb usually requires an explicit subject, so figuring out which word is a verb usually is not a problem. The problem is with 3rd person singular. If you drop the -s, then very often you will be wondering the grammatical function of certain words, especially when you have a stream of nouns/verbs together without anything in between.
Here is a random example I semi-made up:
... he's the kind of person that lecture teachers like Stott and Walker, the kind that the Headmaster take seriously.
When you read this sentence, you will end up with a "huh?" Because you wouldn't expect that "lecture" here is a verb. So the little final -s here ("lectures") would help.
Languages are not exact science. You could do some experiment with removing the verbal -s from whatever English writings you may find. And you will realize that, very often, when there is a stream of nouns and verbs together without anything in between, difficulty/confusion in deciphering the meaning would arise. Do the experiment yourself. And you will be convinced that, although the little -s is not always necessary, it does help when you have longer streams of words. Foreign speakers often find -s to be nuisance, but that's because they don't use longer streams of nouns/verbs that often.
Here is another example:
"... The first one look like any old stone."
So, which one of "look" and "like" is the verb?