The average age of a player making their NHL debut is 20.6 years old, with the mean window being 18.5 to 22.7 years old. It also on average takes about 200 NHL games for a new player to figure it out and become the NHL player he will be.
In Tomasino's case, he's already pushing the end of the average window, does not have 200 NHL games yet, and will not be waiver's exempt. He has a 1st round pedigree, like it or not, and it's a gimme layup that if the Preds can't find a use for him, someone else will give him a shot.
The parallels with how Tolvanen got broken in at the NHL level and their statistical numbers and struggles are obvious. Once Eeli closed in on that 200 games played mark with the Kraken, his game gained the consistency and production that earned him an NHL contract as a solid, two-way middle 6 winger.
There's no definitive reason at this point to think Tomasino can't follow a very similar path. Although Phil's physicality and defensive game are behind where Tolvanen was. In the right system, Phil is trending towards possibly being a second scoring line sort of winger (like what Fiala was when he was here). For this Preds team and in this system, Tomasino is positioned for being traded or someone else's waiver wire claim.