I think it's important to acknowledge the fact that this rifle is practically guaranteed to be banned, it's only a matter of time.
But when the time comes, would you rather have a restricted Bren or a Non-restricted Bren? I can assure you anyone who owns an AR-15 would love to switch it for the Modern Sporter. Both are banned, but the government will only be knocking doors for one of them. It's worth the wait.
Won't this be a moot point with the new back door registry? I share the hope as well but the reality is they will know you have it whether it is restricted or not.