It seems to me like over a timeframe of years from
now, there will be a high value proposition from
running Python on the JVM (and maybe Dalvik),
seamlessly integrated with Java, and that Jython has
a trajectory towards providing more of that value.
I can imagine how it might be difficult to make a
compelling case right now that Jython as a platform
has much momentum, or seems to be gaining momentum.
If a Jython release was imminent, updated to Python
2.7 and 3.1, with as seamless integration as Groovy
between Java classes/objects/methods and Python
modules/classes/objects/functions, I think a case
could easily be made that from a platform perspective
Jython is clearly up with Groovy, JRuby, Scala, etc.