I don't think the point of OneD&D is to ratchet up the excitement level for a new edition like in the old days, because this isn't being designed as a new edition like the old days.
From a business stand point, the old model kind of sucked because it trapped the game in extreme boom or bust cycles. The old editions model was done in response to problems. In the mid-80s TSR almost went bankrupt and 2e was needed to drive new book sales. 3e was needed to help the game recover after TSR finally did collapse. 4e was in response to WotC thinking they could greatly expand D&D's base by appealing to MMORPG players, at the height of World of Warcraft, which was perceived as an near-existential threat. 5e was in response to that turning out to be a bad idea. In other words, the old editions model was inherently reactive.
From WotC's perspective, they now have the most popular version of the game ever, by far, and so they are going to stick with it and keep it evergreen by tweaking as needed. This time, they are not reacting to an existential problem, but being proactive, from a place of strength. So the idea isn't to push out a new edition where everyone either replaces all their books or quits, it's to make updates that cause minimal disruption to a very healthy player base while continuing to attract new players. It's to shift from boom/bust to managed growth. So there isn't intended to be a huge "boom" of excitement for OneD&D because, as they keep explicitly stating, they see this as 5e, continued, and with the word "edition" forever removed.