"Need" is a notoriously questionable word in these discussions. We did not "need" a revised 5E, but we got one and some people at least are glad for it. Star Wars has been a mainstay of the licensed TTRPG market for 40 years. We need a new Star Wars as much or as little as we needed the first one.Given that we already have Star Borg, Rebel Scum, Scum & Villainy, Notorious and countless others, do we need another new system? Just take the Star Wars official stuff and put it on RPGs that the hard work has already been done for.
And everyone talking sales is just making up numbers in their head that fits their opinion. No one here knows. The fact that they keep making them -- WotC made 3 editions alone -- strongly suggests it is a viable property.

