I wouldn't assume he can be easily replaced. Robertson, Jarnkrok, Kerfoot, etc have been tried in the top 6, and none have been nearly as effective as Bunting. Just because you're playing with 2 of Matthews, Marner, Tavares, and Nylander doesn't at all make it a given that you'll be able to put up ~60 points.
I agree we can't just write a blank cheque here, but we got VERY lucky when we replaced Hyman with Bunting. I wouldn't assume we can easily do it again, especially as we've obviously been trying to fill the second top 6 LW spot for years, without success.