They've already stated, many times, that they will not use the purchased TC style frame on an Fi product. You guys can beat your drums every few months about it if you want, but I doubt you will change their minds. And I have no idea why everyone is talking all hush hush about the TC basket, its public info that they own it.
As for a proprietary frame to set them apart from the other manufacturers, that is EXACTLY JL Audio's business model, and what do you all do about JL Audio? Bitch about their prices. You guys can say you expect a custom basket now, but I bet you'll be the first ones to complain if Fi did it and raised their prices to cover more and more proprietary parts that have no difference other than aesthetic.
Hell, JL Audio is not even the best example, the same people at Fi tried your idea, proprietary baskets. Massive, beautiful, capable of massive excursion. What am I talking about? The 06 RE XXX and MX. Yeah, those models, and their prices, really went over well with this crowd, right?
I dont think some of you realize the consequences of some of your requests/expectations.