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I think they can do it, but I dont think the ROI would cover the investment to change hardware and software for a system that currently works. Unless you are up against an hard EOL for your 'traditional' install I think it would be a large gamble to change. Im speaking for 'traditional' enterprisey install bases only though.

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This is true. Most companies either start using Cassandra when their existing database infrastructure is struggling with a particular workload or they're planning a new feature that would be prohibitively difficult or expensive with an RDBMS.

The one exception to this might be a need for higher availability, especially if expanding to multiple datacenters is part of the plan.

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