Possible, the scribes of Egypt were reasonably powerful and powerful classes do like to protect their own interests. But not necessary. Japanese invented sylla

Possible, the scribes of Egypt were reasonably powerful and powerful classes do like to protect their own interests. But not necessary. Japanese invented syllabaries twice, and has added them to the writing system, rather than ditching the logographic system they learned from the Chinese. The Hangul were rejected for a few hundred years before Korea settled on actually using them. Writing is sticky.