So the price of the future will reflect the best aggregate prediction of the future value of the asset.
Well, technically speaking the price of the future will reflect the capital-weighted opinions of the market participants. That is not necessarily the "best aggregate prediction" -- it could be, but there are no guarantees.
A couple of points:
You don't agree to "buy it today", you "agree to buy" it today. Both exchange of payments and assets take place in the future
The price of a future isn't determined by prediction any more than the asset is. The price of a future is given explicitly by the price of the underlying, suitably adjusted for cost of carry and cost of financing
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