According to today's Oban Times an 'amateur survey' by FLAG (Luing's Fixed Link Action Group) has determined that a causeway across Cuan Sound would be cheaper than upgrading the ferry. The OT's conclusion is that this is now 'likely'
The upside is obviously greatly enhanced access for Luing residents, with all that implies - but is it good news for everyone? Here's a few potential downsides posted to kick off a discussion:
~ Possible loss of a unique marine environment - true or false?
~ Local fishing fleet has much longer journey to fishing grounds - will this have an economic impact?
~ Increased distance for lifeboat to travel in the event of an emergency in the local area East of Seil and Luing - is this significant or not?
~ Changes in water circulation in Seil and Clachan Sounds with possible effects on water quality / shellfish farming - anyone know if this is likely?
~ Increased storm surge effect in Balvicar in southerly gales/spring tides with increased risk of flooding - just made this one up, but who knows . . .
~ Popular route for yachtsmen closed (not expecting much sympathy here

~ Massive increase in traffic on Seil likely - has the cost of upgrading the road been taken into account?
In the Outer Hebrides causeways have long been a fact of life. I think it is very likely to happen if no serious ecological, cost or safety issues come up.