You made a lot of improvements on the 500-word argument. I think you're on your way here to making sure your message is clear and understandable to your audience. The language is clear for the Internet and I wasn't confused by what you wrote. I was convinced of what you had to say, for the most part!

In terms of structure, I recommend making it known from the beginning that your solution targets college students. At first, I thought you were writing about drinking in general, but I noticed in the final paragraph and throughout the piece you came back to college students. Can you clarify that you want to help college students benefit from this?

Don't forget to break up the paragraphs a little bit, especially the ones that are a bit longer. Finally, what are some arguments against your proposal? Can you find someone or two people you can critique but also use to support your argument?

You'll strengthen your argument if you can say a little more about the benefits that occur in Europe.

This draft is great, Vineet. Making a few tweaks here and there and you'll achieve the goals you set for yourself.

Why bring this point up? Are you conceding to the other side?

So create a transition to the next paragraph to show that you are meeting the opponent halfway.

Ooooo. That's another good point. Yep yep.

Oooo. That's a cool idea.

Oh, here's a counterargument to this: People get fake IDs to say they are twenty one but with the drinking age lowered to 18 does that mean students will just get fake IDs that say they are 18? Are we really solving the problem?

I like these new roles, but I think it might be difficult for some seasoned teachers or teachers just trained for a role that puts more control on content, to adapting to this new role. I think that's why some online courses don't go as well--the educator doesn't take advantage of the media affordances, or relies on old models of teaching and transfers it unchanged to online contexts.

This reminds me of The New London Group's Multiliteracies manifesto in which they argue that changing technology and visible diverse communities requires a new approach to literacy education. We have to train students to be adapters to diverse social and learning contexts. Seems that MOOCS is one way to make this possible.