Yes, I very much agree: the transfer of content and users to a new forum is something that is definitly not done between lunch and coffee, but has to be set up and managed stringently as a project, with project members that are commited to this task. It needs time, effort and expertise, especially if the aceboard crew is not cooperative.
On the other side, if the risk is that someday the whole forum will collapse, then we should act soon as long as we have the freedom, and not wait until we have to re-act to a desaster.
Separating the Website from the forum, as Shark mentioned, also lowers the risk, so that is something to be taken into serious consideration, and OVH is a good start to look at.
Proposal
I suggest to collect the tasks that have to be performed in order to successfully replicate and migrate this forum to another platform. Then we can structure these tasks, assign resources, effort and prerequisites and get to a work breakdown structure that could serve as a basis for decision --- a decision on if, what to do, when, how, and who will be involved.
Even if a migration is not to be implemented this year, it is good to have a plan ready in the drawer that can be put to work when the time has arrived.
Does any of the fellow lagooners already have some previous experience with a project of moving a forum from one platform to another? Then we could possibly use an already existing WBS as a start.
Best regards,
qbv8