Will there be new community suggested CGs in the future?
Maybe with future Vanguards update in a future we will regain ability to create such suggestions (maybe even PMFs)?
Are there is any answers from Devs about that since PMF application end?
Honestly, I think the writing's on the wall for CGs, particularly community-submitted ones. If they weren't just a thinly veiled attempts to hijack the plot, they were for some asset like a megaship, station or somesuch... colonisation kinda has that covered now though... they're basically mini-player CGs.
From a player submission perspective, excluding anything plot-y, and no need for new stations and such... there's not much left
Beyond that, "Conflict" CGs are kinda pointless tallies of Bonds when we have actual mechanics to resolve them.
Exploration CGs... well... just an opportunity for more money than usual? Same same for mining?
Maybe FD will use them for plot injects here and there, but even then, things like the Thargoid War didn't need CGs for people to do some pretty large-scale effects. They're really losing their place in the game, which is why they're seen less and less.
But yeah, community submitted ones went the same way as community submitted galnet... I don't think either are a great loss.