The question is, if Vampire users really need RTG or P96 in future. First, it is only a framebuffer. You can display higher resolution than on AGA. But thats it. This is usefull for software that came out after Commodore went off. It is for compatibility for some stuff, this is the PAST.
Vampire is the future, SAGA offers higher resolution and more colors than AGA and more. Coming software will make use of it. Why should future software call an Famebuffer/P96/RTG for writing into SAGA, when this programm can access direct SAGA? Is P96 such a beautifull API? I don´t know. Does it already support SAGA? Off course not.
Why paying license fee to Hyperion? And how much? I would pay 2€ per license, not more. Thats enough for old software which is only usefull for some compatibility issue. By the way, I think at the time the Vampire is available to all Amigas, that is the end of PPC-Amiga-OS4...
Maybe I am wrong, as I can not know all facts.