Yes this is teamwork, but that fact that this is even possible was clearly an oversight by Bungie. This would not even be fun and would make many players rage quit and never play again. It should not be possible to keep your super up 100% of the time, that is why they are supers and they are all incredibly powerful. Anyone with the slightest amount of common sense would be able to figure this out.
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It's an oversight but perfectly counterable if he enemies communicated and synced up supers to destroy the bubbles, which would set them back until the bubbles were up again. Communication is everything, shame no one uses it... Probably unintended and should be fixed though.
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remember when the game launched with no team chat because Bungie was afraid of people swearing