I'm planning at the very least to pick up a bottle of Contrast Medium and see if it can work some of its magic when mixed with regular paints. I've been switching over to a washes-over-white method a fair bit recently, so it's timed perfectly for me!
I don't see it as a 'replacement' for other methods, but it's just another tool. In the same way that there are some things you'll want to painstakingly wet blend and some you'll want to wash and drybrush, there'll probably be some things where, as a starting point if nothing else, a quick coat of contrast will save you a lot of work or give you a nice, quick base to work from.
I've seen people say things along the lines of 'if you're going to wash/highlight afterwards anyway then what's the point of Contrast', but I don't buy that logic... You're rarely going to get good results using just one method, it's all about combining them and experimenting with the various techniques, tools, paints and finishes. So yeah, I'm excited to see how I can incorporate it into the way I'm already doing things.