Yes, we should make it optional: https://jira.jboss.org/browse/JBIDE-7058
It is better you can install and have 95% of the functionallity working than not being able to install at all.
Besides with Apple not providing a 32bit JVM anymore Leopard(10.5) users won't be able to run it anymore either (see linked issues for JBIDE-7058)