The top left of the key pad does get very hot.
I thought of trying something, i removed the charger and went on battery.
During my break i watched around 20 mins of videos on cnn.com and then the picture started falling behind the audio and the frame rate dropped.
I am trying one last time, if it doesn't work the way it should on my new MBA (third one) im going to get a MB and wait 6-8 months so they can sort out this over heating issue.
Frankly, I think it's the best thing for you. A MB should be able to handle your vid's just fine.