Are there any non-bureaucratic hurdles preventing more widespread adoption of synthetic vision?
It's not bureaucracy in the sense of pointless red tape, it's the demands of certification for brand new systems on Transport Category airplanes.  The hoops that have to be jumped through are epic. Engineering standards, testing this, testing that, covering every conceivable possibility (or trying to).

You always see new innovations in GA, then Corporate, then Transport, because that's the certification difficulty ladder imposed by the demands of having to achieve near perfect safety with a better than one in a billion risk of a catastrophic crash due to a component failure.  (Airliners are, by a far, far margin, the safest way to get form A to B aside from an ox cart - there hasn't been a crash of a heavy in the US in, what, almost 20 years now?)