Future proof yourself. Convert your finished work to tiff.
Yes, well that's OK up to a point. However in my case I have tens of thousand images that I haven't got anywhere near processing (I know, it's ridiculous, but there you are ... I enjoy taking the pics more than working on them). All my finished work is in tif or psd ... BUT, one of the really nice things in Photoshop is the ability to embed the raw image as a smart object. That means that if better raw processing comes along we can make use of the improvement without having to redo the whole edit (or we might simply want to do some tweaking of the raw processing). What happens if you do this in 3 years time, stop paying for CC ... and find you can't go back to whatever ACR version was supported in CS6?
What happens if you use some of the new filters in CC and these don't work in CS6? And so on.
To my mind, CC is a one-way trip ... going back is more than likely going to be very difficult or impossible. So I do think there's real cause for concern, and I really wish Adobe would find a way of allowing us to freeze our software at a certain point so that we could continue to use it without being obliged to continue with the subscription.
This sort of business model may be good business for now - but it really will encourage 3rd-parties to step up. My hope is that when that happens, as it will, Adobe will find it necessary to become a bit more flexible.
Robert