Any forks of systemd will have to be renamed to something obviously different from plain “systemd”, but forks already work that way. We are not, for example, using “XFree86” even though the current X Window System is derived from XFree86 code.
Nor must the program files (shell commands, etc) be renamed. OpenSSH still uses the program file name ssh for compatibility, despite “SSH” being a trademark belonging to someone else.
The only dogma systemd has broken is that booting has to be slow, complicated, and unreliable. Good riddance.