问题在于，该预测假定产量将持续上升，但实际情况可能并非如此。

The trouble is that the forecast assumes continued improvements in yields, which may not actually happen.

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网络泡沫的破灭使大多数这类预测变得不可信，在随后的几年里，随着人口普查局持续报告在线销售疲软的情况，传统零售商对未来的信心增强。

The dot.com bust discredited most predictions of that sort and in the years that followed, conventional retailers' confidence in the future increased as Census continued to report weak online sales.

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报告预测，这一趋势将持续到21世纪20年代。

This trend will continue into the 2020s, the report projects.

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