Haven't listened to any of the livestreams related to colonisation so I've no idea when a new colony adopts the BGS so maybe that, specifically, won't be an issue but I'd bet my house that there'll be some exploit available to malcontents that makes life harder for people attempting to start a colony.
As far as i remember, the BGS proper kicks in once three colonization beacon becomes a regular old beacon.
The thing being though, if it's super simple to drop a colony into lockdown, it's super simple to get it out too... but PvP players, well, PvP. They don't tend to go doing PvE activities which are the easier way to induce these things... and people who do fiddle with BGS stuff equally don't tend to just put random systems into lockdown, because the effects are temporal and, bluntly, a boatload more effort than killing other commanders.
According to
@varonica, there are stations along the Colonia highway that are suffering from detrimental BGS states with no end in sight. And that's not due to sabotage, it happened naturally.
There's a couple things to remember with that though, which means "it's not so bad"...
Firstly, those colonies are isolated
and in poor locations, generally speaking. So it's not impossible to get it out, just hard in general.
Secondly, these get regular traffic which would induce states which eventually cause lockdown, but people wouldn't hang around to oppose it, even if they knew how.
For colonisation, this won't be an issue because all colonies are within 10ly of each other, so you won't get the weird edge cases occurring like what happens in these places.
(Oops... but people want to place colonies further than that....

)