I have two thoughts on the illegal contact rules:
1. They had to do something. Enforcement of illegal contact, defensive holding, and pass interference has been terrible and uneven, and if their emphasis is on calling it every time it's committed -- rather than whenever they feel like it -- that's a good change toward fairness of officiating.
2. You're not going to see this many penalties during the season. They will either relent and dial back on enforcement, or the players will change the way they cover.
Either way, if you think this 'ruins' the game, you can thank Seattle. If they hadn't done what they did so effectively, and then bragged about their technique for getting away with penalties to some guy from Sports Illustrated, it might not even be an issue.