It's hard to say with PP's current products. In some cases it looks like it, when we see full plastic/resin kits of warjacks and warbeasts and a few units. But then there are ones who say the opposite, like new warcasters/warlocks and the new huge-based models using a combination of resin and metal.
Metal is a pain. It's harder to get to stay together without accelerant, and even using accelerant makes the glue joining a lot more brittle in the inevitable moment where the model will fall and shatter into its component pieces (it's never a question of if, but when they'll get dropped or fall). The only time I don't have an issue with metal is when the whole model is a single piece and just needs to be put on the base.
I don't get that problem with resin, be it the plastic/resin kits PP puts out or the Citadel Finecast models from GW. The models seem to glue together a lot easier without the need for accelerant, and are a lot stronger because of it. I've seen someone drop one of their plastic warjacks and it simply bounced yet remained completely intact (he just needed a quick retouch of the paint, of course). Hell, I can huck one of my Fennblades across the room and it will bounce unharmed.
So is it PP's plan to ever drop metal entirely, much like what GW's plan is with their Finecast line? It would be nice to be rid of metal completely when you can get the same results with plastic or resin these days, yet be more durable on top. And I wold have no problem paying a little bit more for new models in plastic rather than metal.