This may be the year, there are a pile of star players coming off entry levels this year.
M&M in Toronto
Laine and Conner with the jets
Rantanen in Col
Point in TB
Aho with the canes
Tkachuk with calgary
slightly lesser guys like Werenski, colin white, Timo Meier, konecny and many more.
It is likely that the top guys (Mathews, Marner, Point, Laine, Rantanen) are all waiting for someone else to set the market price so its likely quite a few guys get to July 1st.
Then all it takes is one GM and a player looking to make something happen.
Take Matthews as an example, he is quite happy to stay in TO but we reach July and still no contract. Arizona comes calling and offers 7 years at $13.5 million (he would sell hockey in the desert) Matthews may sign that contract as there is no downside, either he is back home in Arizona or like shea weber years ago he pushes his existing team to match giving him the money he wanted all along.
If there is one the dam could burst, Assume the above happens and the Leafs match- someone like Lou is waiting in the wings to try to sign Marner to a offersheet the Leafs can't match after the matthews deal. Same senario can play out with the jets who will have lots of high end RFA's
I will say this, if there are no offersheets this year then they may as will remove it in the next CBA as it will never be used again. This year is the perfect storm.
Most teams still have their 1st round picks to make an offer sheet.