I was told by Sahil (the CEO) months ago that purchases SHOULD remain accessible in your Library, but yeah, I'd download them all just to be safe.
I opened a LoyalFans months ago in case this actually happened. There's nothing on it currently, but you'll be able to buy new releases on there going forward (no subscription needed) as well as on C4S. I'm still deciding on whether to offer a subscription option as well. The question is whether I will be able to provide enough content to justify it.
It's just a bump in the road, guys. LoyalFans has me kind of excited, actually. It was founded by the original owners of Clips4Sale, and its user-interface is like a mix of OF and YouTube. VERY intuitive.