I think the real reason those people from the Halo CE LAN days are older. Likely in their 30s-40s married with kids and a full time job. Eventually, you stop playing video games. If you were from the Halo CE LAN days and still playing video games........
I dont buy that. There are a lot of game series that are even older that manage to still put up good numbers. And it isnt even about LAN its that is has NO local multiplayer what so ever. Some people didnt like that and refused to buy.