The JBridge site confirms exactly how it worked with Ableton before they finally did a real 64-bit version. I could reliably crash JBridged Kontakt loading a large orchestral template. That is what led me to ditch Ableton and move to Cubase back then. And really, getting even 3.5G required doing some tricks to load stuff into high memory.

Instead of trying to use JBridge to make a 32-bit BIAB work with 64-bit VSTs, the correct decision *should* have been to make a 64-bit BIAB, and use JBridge to connect to legacy VSTs that were 32-bit only.

Based on everything I've read, and a support chat I had with Andrew a few months ago about 64-bit, I expect to see a 64-bit BIAB by roughly the middle of never. He cited 2,000 or 20,000, or some ridiculous number of VSTS that 'could never run' on a 64-bit BIAB.