We unconsciously assume the permanence of the "enterprise" software business, in which great salespeople sell crap software to clueless administrators. But that sort of thing can persist for a long time, then suddenly crumble. Not saying it will. But a promising spot to poke.
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Successful startups are those that know things which inspite of being lindy will come to an end
This phenomenon is not likely to end. That does not mean that startups should not go after legacy Enterprise businesses.