Yeah, but that line is already questionable defensively. I guess Pouliot wasn't a defensive stalwart either. Nash and Hagelin are both pretty responsible defensive forwards, while Kreider I'm not sure is quite there yet.
Offensively, for sure, Kreider is probably the best internal option for that line.
I'd try to keep Hags with Marty or Nash and I think Kreider plays a game most similar to Pouliots (although a lot better) and may replace him the best. However that leaves a hole on the 3rd. I fully expect a few rookies next year. Miller, Fast maybe Lindberg. Fast hopefully is a RW hagelin. Miller hopefully becomes dubi-esque, but im starting to have doubts with him. I feel like Allen is very close, if not ready, and will challenge for a spot next year.