Well, this is only based on a delay of the ban until 2016. There is just no hint at all, that the ban will be delayed until then.
No based on 2015 (which I deem unlikely). Still doesn't put away Bhall's argument in any way.
The letter from Charlie (Boullier calls it a technical directive) states, that every sort of interconnection is forbidden by the current rules. There is nothing why it could take until 2016:
"Failing this, we would have to consider making a report to the stewards about the non-compliance of any car fitted with a system which appears to allow the response of the suspension at either or both of the rear corners to drive the response of the suspension at either or both of the front corners (or vice versa)."
There's nothing in the current written regulations that forbids interconnected suspension, nor there will be in 2015. That's a fact.
A technical directive still needs a very specific connection to a specific ruling. For instance we had the debacles with how the fuel flow would be measured at the start of this year, and last year we also had a technical directive that excluded a coanda exhaust solution from Williams. Both were directives acted properly in that regard, acting as clarifications of existing ruling.
However, you can't ban a system like fric based on a technical directive. To what are you going to couple it to? 3.15 only acts when it goes about moveable aerodynamics; interconnection on itself does not mean that. To ban interconnection you need a new regulation, and that's not until 2016.
Like beelsebob said, this would in turn ban anti-roll bars. That's insanity.
Also, this is what Bouiller says:
"I think most of the teams, if not all the teams on the grid, are using this kind of suspension system, which connects the vehicle dynamics better.
"Some teams may have been extreme [with their FRIC design], this is maybe why the FIA is questioning the legality of the system."
I feel the FIA can at best reduce it to "better vehicle dynamics". An ungrounded "technical directive" or a bit of treatening from the FIA still doesn't change the fact they can't enforce it properly.

No...front-rear connection. Anti-roll bars do not connect front and rear...
This is what you said and I quote:
that every sort of interconnection is forbidden by the current rules.
Beelsebob's argument is valid, too. Anti-roll bars fall under "every sort of interconnection". So either you misquoted, Bouillier misquoted or we have large hiat in this supposed-to-be TD.
If any of the teams feels they are being played with, and have the courage to take it to the FIA court of appeal, the FIA will not be able to refer to any regulation that bans interconnection.