Multi XML History...Future?

So...

who remembers the first 3 xml light offered?

there must have been several others available soon after...

and I'm guessing the drop-ins were available next...but how longer after? Is there even a decent one available?

you see where I'm going with this

what I am wondering, is when we'll see a 5 xml drop in

gaze into your crystal balls and guess for me

I'm primarily interested in 5 more than 3 because I think they'll be 5 to 10mm wider than the existing multi emitter drivers/reflectors (maybe that's false?) ...and I have a host in mind. 6 will be killer (easier to DIY drive)