We are seeing less of those type of hits lately and In the heat of the moment I would argue that players that make that sort of a hit aren't thinking at all. So making it a major instead of a minor in my opinion would do little to change that.
While I don't think its that prevalent its not that uncommon either but still I think the decisions for refs to make should be taken out and just make it a flat 5min major for this. Unfortuantly I think the USA as a whole is too reactionary rather than proactive to any sort of situation. Some serious s*** has to go down before something is done.