Exactly. Given the nature of Open Source, anyone is free to fork something and say "I'm going to keep maintaining the old thing forever". But that's often not feasible solely with the handful of people and energy of those people interested in a given older technology, especially in a world in which people expect pieces of the ecosystem to cooperate and interoperate with each other.

So, instead, the standard tactics are to 1) push people and projects to maintain the old thing for them as long as possible, 2) treat any new technology that doesn't give you free support as a threat, and respond to it with fear, disparaging and attacking the people and projects who are no longer willing to maintain the old thing forever, trying to rally others to pressure them, and 3) disparage and attack technologies that require integration/cooperation between projects, because it raises the bar for the amount of maintenance effort expected.

New projects should decide up front, and document very clearly, whether they're willing to offer substantial amounts of maintenance effort on behalf of older or more niche technologies.