I have to echo wcreed51's comments.
I don't think being a 32 bit app really hurt Notion much if at all. It would be good if Notion implemented its own 32-64 bit bridger/wrapper or if they had a rewire bridger, but I don’t see how the performance would be dramatically improved as a 64 bit app compared to the current platform with JBridge.
Notion simply needs to expand its notation and formatting options (most of which have been outlined as feature requests, bugs, etc) in order to play with the big boys (Finale and Sibelius) on the notation side.
From a production side, Notion just needs to add native syncing support (MTC or LTC; instead of relying on a plugin [see link below]), refine its rewire implementation (also outlined in feature requests and bug reports), and increase the number of natively supported 3rd party libraries. Most production requests could be solved with better syncing capabilities and Notion’s appeal will expand dramatically if additional libraries were supported.
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MTC solution thread (
viewtopic.php?f=16&t=1470)