Is this the end? No more WRC?

It is the end for EA Sports WRC as well as both EA and Codemasters won't be making any more rally racing games. 

But the WRC organization itself said their WRC gaming franchise is going in an "ambitious" new direction with news coming in the future. (Right at the same time EA and Codemasters made their announcement)

So it's both yes and no. 

Yes that it is the end and EA and Codemasters are not making any new rally racing games. No that there are still going to be more WRC games but made from different developers and publishers. 

Link: Codemasters loses WRC license as EA halts the series