"I'm thinking about something very weird right now..
The possibility of using this attic air heating system,
to heat my basement during the Summer of 2014.."
Don't do that. You'll be heating the rest of the house too and need additional cooling as well as bringing high dew point air into a place with cold surface temperatures which will cause condensation and that moisture will migrate upstairs.
"..right after blocking up the ridge vent with shopping bags."
You shouldn't do this either, this will become especially important when snow starts to fall, you'll have ice dam city on your roof. Even without the issue of ice dams, attic ventilation is important for moisture mitigation and by keeping the air stagnant in the attic you are increasing your risk for mold and wood rot up there.
We ventilate attics for a reason.
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