I said no for 1 main reason and a few 'minor' ones. You didn't describe the government system; is it going to be Merito-Hereditory Feudal Diarchy with hints of Vassalage like in the show or any other like: a constitutional monarchy, an indirect democracy, a direct democracy, a dictatorship, etc. Because if this hypothetical nation does not follow the example of the show I will not like it. See Bronies are a diverse bunch with a range of political opinions. Such a range, in fact, that I reckon that it would make any sort of democratic government run slowly and messily, kind of like the UK's (I can say that because I live here). We all know why a dictatorship is no good. So why would the 'Merito-Hereditory Feudal Diarchy with hints of Vassalage' run well? Well we don't know that it will, but it's never been tried before so it's worth a shot, and considering the nation would be populated by Bronies we all at least have a rough idea of how it should work, because we watch a show with it in.
Now on to the minor issues:
- What will we do to the people who used to live there? Kick them out? Kill them? Force them into a Starlight style rehabilitation room where they're indoctrinated into being a Brony? This is a legitimate problem.
- Location? Considering that we're all from around the world, we're all used to different climates. Then there's risk of foreign invasion, natural hazards, economically beneficial location, agricultural beneficiallity, etc. Out of preference this would be an island not too far from the mainland, so like part of Canada (but not too far north).
- Language. This is self explanatory.
- Terrorism. I'm certain that there would be some nut jobs who'd attempt to bomb the place purely because it's populated by weird people who all watch My Little Pony.
- How much of a priority internet speed is to the government. This is very important, trust me, I've said Vassalage 3 times, which makes me smart.
I guess we have different styles. I'd sit in this haven and attempt to direct it to assist in dealing with this burning, either that or sit there and watch the burning because I really don't care anymore.