Halo 5 launched in a terrible way, 343 did well to give support and update it over the years, but my love for H5 still ran dry and I found myself returning back to MCC for the core trilogy, especially for Halo: CE. I don't have high hopes for Infinite, given the track record of 343 and their shabby game launches, but I'll play through campaign, then possibly stick around for btb if I find it exciting enough.
If my H1 btb crew buys the game as well, we will take some time off from MCC, but nothing will break my love for H1, with it's dynamic power up physics, bizzare vehicle physics, predictable item, vehicle, & player spawning system, grenade tricks, and boundary breaks etc.
I'd really like to make big team battle more competitive, but many skilled players are jaded by the drastic changes 343 made with their Halo games since 2011, so I imagine that they will keep to their favorites that they know and love.