Cancel the F2P instead, it is going to do demonstrably more damage to Infinite than having a X1 version will. While we are at it drop the "10 year plan" as well because it isn't a plan, it is at best a rough outline of how they hope things will go. 10 years of support goes both ways, you need a community that will be there for the 10 years in order to for any of that support to matter. That level of support is something you earn, its not something you plan for unless your entire strategy revolves around manipulative monetization.You have to plan for it. You don't earn it, you never really have. The only real example of "earning" it is maybe warframe. Ya need a rough plan for long-term support. That plan can change and time passes but ya need a plan regardless. Also, a ftp multiplayer is prob the best thing for Halo. Why? Cause halo isn't popular. No matter how cool the game looked, it would not pull people away from other shooters with ftp aspects. A low barrier for entry is the best option and let's be honest, the loss of color choice is worth the increased potential of halo becoming the main contender in the world of gaming again. Sure it sucks but eh, ill get over it given im mostly red and blue anyway. Is there risk for a predatory mtx system? Yep, but there always is regardless of it being ftp.
I'm saying you have to actually earn the community support for any of those plans to matter. You can plan all you want, I'm sure Bioware had all sorts of plans for Anthem as well, fat lot of good it did them or the game when no one showed up to actually play. A ten year plan isn't a plan at all, its a goal, nothing outside of a year or two(at best) has any meaning as anything could change between the time Infinite releases even a year beyond that. Case in point MCC's promise of the games being "exactly how you remember them"
I also don't care about how many people might come to play Infinite due to F2P if the game is just a miserable experience where the only reason many players stick around is due to constant manipulative skinner box garbage.
More importantly I have my doubts about the assertion that Halo isn't popular. They might not be as popular as Fortnite or CoD or what have you but a franchise that regularly sells multiple millions of copies is not "unpopular" by any reasonable standard. It may be less popular than it used to be, but the most straightforward answer for why that might be the case is that people just don't enjoy the newer games as much as they did the older games.
If Halo honest to god can't make money in this day and age(which it obviously still does but I digress) I would prefer to see the franchise retired rather than limp on as a parasite that relies on the worst impulses of its audience to survive
Bottom line is that the F2P is still going to have a bigger net negative effect on Infinite than having an X1 version will.