Holy Missing the Point, Batman!
From this otherwise uninteresting article:"Our clients say, 'My god, is [query] performance worth sacrificing all the other gains'" of traditional database systems. They include ... the enterprise's existing investment in trained database administrators...
Holding on to a technology because you've already trained people to use it is what I call "growing dinosaurs". It makes understandable short-term sense, but anyone using it as a serious long-term justification is in big, T-rex-size trouble.
And for the record, the other reasons to stick with existing database systems that are listed in the article are all short-term maturity problems, not serious fundamental flaws. I wonder how IBM and others will attempt to downplay column-oriented systems in a few years when all those wrinkles have been ironed out...
For 20% I don't think there is anyone who could cost justify a migration. Now if it were 20x, it would be different story.
"Query performance, while interesting, is just 20% of the story,"
The 20% in question, then, is not performance improvement, but part of the decision making process that performance plays according to Jhingran.
More likely, IBM etc. will absorb the more proven column-oriented technologies into a hybrid.