提出TTOSA概念，统计闭源软件到其开源替代出现的时间，平均为7年，并预言未来开源软件将主导业界。
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作者在文中提出一个概念 "Time Till Open Source Alternative" (TTOSA), 即从闭源软件出现到其直接的开源替代出现所用的时间. 作者统计了不同流行的闭源软件的 TTOSA, 得出了 TTOSA 平均为 7 年的结论, 并对数据进行了进一步分析, 最后预言未来业界会被开源软件所统治.原文
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