Firm optimistic fence-sitter, myself, but a little physical evidence would do wonders for the proponent side of things. And that "little physical evidence" must be extremely difficult to provide. Otherwise, the skeptic's side would be found wanting.
As it is, they've got the upper hand. As in the 1984 Wendy's commercial, the actress Clara Peller asked "Where's the beef?"
Until something/anything other than sketchy evidence is proffered, proponents should learn a little humility. That's the way it works in the real world.
Before you nail me to a cross, I believe (note:believe) the PGF depicts a flesh and blood creature. But since October '68, there is precious little else to stake a claim upon.