Yes, it's still relevant.
It was a big deal when SwiftKey and Android 4.2 implemented its own version of "Swype" and both promoted it. I've used all three KBs and prefer Swype because it's the most accurate for me.
Not being available in Play store doesn't mean you can't get it. You just go to their website, sign for the beta, then you download the apk. ANYONE could do this.