Can you explain this a little bit further? Genuinely curious.
At least from a systems perspective, it's hard to imagine that getting stale. It seems, at the moment, that his structure works well against teams that have a poor defensive structure and/or not much of a forecheck. The teams we've lost convincingly to so far are teams that have a really good defensive structure or similarly good forecheck (Wild and Panthers). So it seems it doesn't work as well against those teams, although they did just beat one of those teams in the Isles. Some of that gap can be chalked up to a talent gap as well, obviously. Very early to tell, but those are my initial observations.
As such I can see why this system may not work as well in the playoffs when opponents are forechecking hard. But at the same time, it reminds me a lot of the way CBJ played against Tampa when they swept them. So, down the line when the young guys develop, combining this system with some high end offensive players and a fast defense seems like a dream. At least for the moment.