Every time there's a coaching change, there are unfortunately roster casualties. And it appears like Frolik will be the first (Czarnik will probably be the second). Unfortunate because yeah, he's excellent depth but for cap reasons, he was always a strong choice to be traded in the summer anyway. This just pushes up the timeline.
However I don't see Treliving rushing to make a deal though unless it addresses needs and doesn't set the team back or Frolik becomes a problem in the lockerroom, which seems unlikely. Which is why of course, Walsh is tweeting about it; he's trying to force Treliving's hand.
The biggest issue is that it's really hard to trade salary during the season without getting salary back, especially guys without term going into next season. Those deals tend to take a while to setup. And Treliving will of course need that cap space to sign Tkachuk, Rittich and maybe Bennett. Otherwise something like Frolik+ for Perron would have been ideal.