In terms of more offer sheets, this was a perfect storm caused by Edmonton leaving 2 RFAs unsigned. Had they signed one or the other early, it's unlikely the Blues try what they did.
I don't think we will see more offer sheets. If anything, we will see less because teams might see this is a reminder to be more conservative when it comes to leave players open to offer sheets. Teams already do work to defend against offer sheets like trading RFAs before.July 1st or signing the player asap, but I think this could lead to teams being even more defensive.