That's interesting, as it suggests (based on just that statement, of course) that the popular game modes may be those that adhere the closest to normal League play. ARAM is teamfighting-focused, OFA is one champion, and URF is faster, but all three have fairly normal League play outside of those additions.
I'd be curious to see if that's an actual trend, and if, say, reducing the value of Nexus Blitz events and using them more like Dragon buff-level rewards instead of the (often) increased power they have now might actually increase player interest, since that would make the normal gameplay a bit more similar to the apparently winning formula of Normal Gameplay + secondary gimmick. Right now NB does feel a bit event-dominant conceptually, even if in practice events aren't as large a tipping point as actual gameplay. That might also be due to the fact that the warning about where/when an event takes place isn't as pronounced, so we don't really have the same sort of pre-objective macro-game we often find in Rift.
Just sort of pondering aloud, because of course that would mean losing some of the zaniness that can be very appealing, and I'm not sure that's to the mode's advantage. I just know that in some of my games it often feels like Event Blitz instead of Nexus Blitz until the very end.