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That's Erlang in a nutshell, though, isn't it?

Erlang still has a lot of warts. Just wait until we have cheap threads in the JVM.

The JVM had them a long time ago. They're gone, and it will be very hard to bring them back.

i think instant scalability will come from an application server, something like glassfish for example

deploy your application to glassfish and let your AS scale it

That doesn't really handle data access / storage bottlenecks, unless I'm missing something.

or google app engine.