I'm going to have to ask you to clarify that since it sounds like you want a ban on PMF's for any group of less then 50 people.
So to be 100% clear I
would have wanted that. However, its too late now and not fair to start removing groups, although I suppose inactive groups are a prime target although how they'd be identified I don't know...
I went on a bit of a tour last year when I played more Elite, I went through a bunch of systems just seeing what's there in the bubble in terms of sights and systems. I checked out any player factions I found on google and to be honest half of them I couldn't find much/any information about. Many looked to be under 10 active people with lots in decline in influence in favour of the standard non-player factions. Guess work but I'd say it looked like only 2-3 had been active in the past few months for most groups. It just felt like a big waste of developer time if I'm honest. Sure there were some factions that were in a great state with active sub-reddits, private forums, websites, wars. I even met a player or two on my way through and had a chat about the local lore/history of their group. They were rare though.
I'm all for factions if they are active but I feel more stringent entry criteria and fewer yet larger more supported factions would have given a better experience at the end of it and led to a better feed-in system for Powerplay and the like. I mean we've had what, 23 months of PMFs or something like that, only a single Powerplay power come out of it. I suspect due to Dev time to implement a new power but I've could be wrong on that.
One idea I did have was to have a faction called "Emergent faction" that randomly appears in any system (except ones like Sol/Achenar etc). If players support and foster this to owning the local system and into expansion state then a PMF is created for those that did it with the owner/regulator being the one who did the most BGS points for the faction to that point. Would prove an active and dedicated player base capable of maintaining a faction since they already have. Want a faction? Find an emergent one and lead it or wait in your desired system for the Emergent faction to appear.
That way Frontier not only get an auto-message saying "this system here needs a PMF and this cmdr did most work" but also have an "owner" for each PMF. Owners can be updated to new ones anytime via a google form or whatever and needs e-mail approval from the current owner, Database at FD updates automatically from this so no maintenance times.
That way if a faction starts to fall/fail or whatever then that owner can be contacted to see if they want their faction to disband or not which could be done by a Galnet article with some flavour text that it didn't work out or that X group forced them to relocate or whatever. No response from the owner in say 14 days means the faction will fail.
If it fails for whatever reason all the players have to do is find a new emergent faction elsewhere and try again. A truly dynamic system.
If set-up right you could run the whole thing with an Dev basically checking in for say an hour a day as 90% would be automated. It'd sadly now it's too late, will see what squadrons brings in Q4 but Im not 100% happy on how PMFs were done.