In the last 10 years, there have only been 2 offer sheets signed. One was a revenge for the other. They were rare and have only gotten more rare.
Money is going to be tight around the league. Most of the good teams have no cap space, or only have the cap space they need to re-sign their own players.
The Rangers can fit him at 4.2 mil if they have to (Goodrow should be moveable and can be bought out as a worst case scenario). Teams would need to go higher than that to make the Rangers not match.
Other GMs don't want to piss off the Rangers. As we've seen with Kane and others, the Rangers are a popular destination for players. Other GMs want to be on good terms with the Rangers. If a team did offer sheet Laf, you can bet your ass that James Dolan would retaliate.
A lot of people said last year that Kakko would sign an offer sheet. He didn't. The same will be true with Laf.
-Offersheets are rare because teams generally don't let themselves be in a position to cheap out on their top young players. They're also rare because players don't really sign them unless it makes sense for them money-wise.
-Money is not going to be so tight around the league that teams aren't going to be willing to make a play for the 2020 1st OA pick. Especially rebuilding teams who, you know, would be most interested in taking a chance on the 2020 1st OA pick.
-If the Rangers can fit Lafreniere at 4.2 mil, then they better be offering more than what ****ing Yakupov got almost a decade ago with a much lower cap ceiling. Because Laf would just sign it knowing it means he's back with Rangers at a fair price.
-The Rangers are not the only popular team in the NHL. And frankly, no team should bet that the threat will stop teams from taking a chance. Especially since it doesn't seem likely they'll be in a position to make an effective retaliatory offersheet for a while.
-Lafreniere is more valuable than Kakko was. If the Rangers offer him more than Kakko (like, say, something between 3-4 mil), then I doubt he'd sign an offersheet.