On this specifically, I think it would be better if votes for making a new nation or whatever done on server through the realm plugin to automate the whole process, namely, when it comes to gathering votes, I think the realm plugin can view the person giving a vote to a Nation, check their forum ID and total and recent playtime before sending it as a valid vote, but this also gives us the option that should the Group they pledge to manages to become manifest, you put them on a 5-8 month cooldown before they can vote again so players can't just keep hopping around.
I think the two other points can be addressed simply by expanding the scope somewhat and giving players more options when it comes to making places for RP. As of right now, you either gun for Nation, make a Vassal under another Nation, or try to make a Lair. For a group like Vansk, it could be argued that if it were to build up from a smaller-scale community rather than starting as a Nation, it might have had more luck and grown or otherwise just stayed as a smaller settlement. I think it is fine for any player/group to want independence from Nations and Vassals, as there are many factors that might contribute to them desiring such, both as a mixture of IRP and OOC reasoning. I think forcing players to interact with things they don't want to ultimately leads to a miserable experience for everyone involved, and if players want to blow mina on projects, just let them; they'll either learn from the mistakes or keep trying, and if we only care about engagement with the server, so long as it isn't maliciously OOCly driven, this would provide it plenty.
What it ultimately comes down to is what metric the server/RP group is considered successful by? Personally, for me, while I do understand the appeal of the server having 100s of players on at any time, I prefer more quality RP over the quantity of players that spam simple dialogue. Another thing to ask is whether these systems should be entirely aiming for longevity or promoting engaging RP. This is simply to say that if I wanted to, as a player, make a bandit camp fully player-run and driven, I can't exactly vassalize under a Nation as the Nation is held accountable for their existence (you can not claim a mechanical vassal was made IRP without knowledge), Lairs are more lore-based, and a Nation would get instantly warred for being overtly evil without any regarding to allowing some form of drawn out conflict and that is setting aside spending 25k mina for what would be a temp group to stir abit of RP is a bit of bad investment. I truthfully think a more nuanced and thorough approach needs to be taken in regards to how 'RP Hubs' are meant to exist and function on LotC and what the ultimate goal is, while giving players the freedom, tools and understanding what they are actually signing up for so people can generate RP without worrying about their shit getting nuked instantly.
Edit to say, also all future systems need to be designed to prevent players 'optimising' the fun out of this server, force them to RP..