I'd be really shocked if Aimia had the balls to devalue Aeroplan now, after all this. I would think the miles would be safe for another year or two at least, up to the point where they'll be discontinuing their contract and Star Alliance seats will stop being available - then the miles will be worthless.

I wouldn't hesitate to keep miles in the account now, though maybe not in the millions (as the credit card churners might have).