Disclosure: I am not an IBMer, but I am a Dojo Committer.
If IBM dropped Dojo, theyβre doing a good job of this. ;-) Anyway, their installment rate has risen sharply last year and continues to grow. Just in time for Dojo 1.5, I published at least a dozen IBM contributions to Charting. One of the major new features in 1.5 will be the new Claro theme for widgets - developed and provided by IBM.
A number of contributors and committers work at IBM, some of whom have been hired because they are Dojo experts. As far as I can tell (I don't know any IBM secrets), their jobs are still safe.
In any case, although IBM is probably the largest sponsor of Dojo, it is not in the driver position, and Dojo can survive without their help. Although sponsorship is pleasant and always appreciated, the main driving force behind Dojo is passionate programmers, not corporations.
To summarize: don't worry about IBM's position.
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