There are even companies out there that publish a game and then let it die in the months after.
CoH2 probably does not generate a huge amount of revenue, which is also supported by the fact that officially no one at Relic is responsible for the whole CoH franchise anymore (plus having transferred patches to the community in a first step). Furthermore, people on the balance team apparently also have no information about long term commitment by Relic, otherwise otherwise I assume we'd know it somehow. The 64 bit version is likely due to Microsoft wanting to make their game pass more attractive. Obviously no one knows what the future will exactly bring, but chances are high that after 7 years there will be no major support for almost any game out there. It is already surprising that Relic provided patches for so long, even if they heavily reduced their involvement.
And the CoH3 everyone is hoping for is more than just a couple of stat changes, we'd need some actual coding for that plus modding and workshop support, all of which we are unlikely to get.
And you can't imagine that coh3 couldn't simply be an enhanced coh2? I don't know if Relic or Microsoft are willing to build a new game from scratch when they can simply take back the development on coh2 and build around it.
As we know the RTS community is small and anything that can reduce the development cost will greatly help to have something at the end.
THe 64bit development for coh2 and release of coh1 on mobile show that Relic or Microsoft are willing to continue the COH franchise's adventure but not from a new perspective. They'll take what they already have in stock and use it to propose to their audience new contents or find new audience on different supports.
They already have a great engine that need a serious polishing (we all agree on that), what they lacked in the past was a game design and community vision. And from a year or two they're starting to acquire both of them, they used us to learn to build a game design that suit us as players (community patches) and put in place the elements to build a community and provide relevant content to it (championship, tourney etc...)
I'm curious to see what they'll propose, and if I'm right about their on-going strategy.