I hope it'll last long, but people are already complaining and being turned off about the limited content at launch. Limited gametypes, lack of Forge, and remixed and breakout maps counting towards the final map count as well as half of the Warzone maps being remixed is a bit disappointing. But, we're getting a bunch of free stuff post launch. It's all about quality over content. I just hope gamers stick it through and I hope the game gets positive reviews.
In my opinion, 343 also needs to adress that BTB, Forge, and all the other gametypes and DLC maps will be FREE and coming SOON. They need to at least include that in the menu somewhere to prevent people, and casuals from pointing fingers and setting blame. They're already blaming 343 for false advertisement and cutting content and that of in itself is bad. Advertising and marketing can go a long way, but an angry YouTuber and angry YouTube comments can heavily sway whole groups people away easily. Especially if they don't do research and spew lies.
I've already got done watching this guy hating on the game because of Microtransactions and saying there's cut content and a lack of maps and playlists... All his following are already starting up bad news so hopefully it all ends well for Halo 5 and 343...
I for one, cannot wait. It's literally a few hours away... I believe there's loads of content being added later on with lots of replayability and interest. 343 just needs to let people know it's there and it's coming.