I wasn't particularly clear in my wordings above, so maybe I can clarify some things about the hotspots....
Firstly, there's no reason these hotspot "events" need to be back-to-back. In fact, they probably shouldn't. Something like they're only around on the first week of each month would work better. (If you wanted to get crazy, each day of that week could have a new set of hotspots to ensure people are really moving around and not sitting in one spot all the time.) Maybe just the first and third weekends of every month would have a hotspot event. Whatever it is, it should be occasional, but—unlike the official events and GBR—you could better count on them to be there on time.
Secondly, every mission would eventually be a hotspot at least once during the cycle (yes, even White Beast if it exists on EGS), possibly more. At any rate, if one mission gets the bonus twice, every mission should. Nothing should be left out.
Thirdly, there should always be multiple hotspots during any "event." If Mission A gives out bonus EXP, Mission B gives bonus PA EXP, Mission C has increased drop rate, and Mission D gives bonus MP, which one is the one you "should" be playing? Probably one of those, but it still gets people to spread out a bit and choose what works best for their current goals.
On the official servers events "limited" mission selection as well, but a lot of people seemed to enjoy them (until they hit week 2, had stupid login problems, etc.). The hotspots idea is mostly to create a simple event-like aspect without having to go all out with it. It would be predictable, yet wouldn't give out so much of a boost that playing the game without the bonuses was a total waste of time. It's also about bringing people together to run missions they might not have run otherwise or play with people they might not have ever met. It gets people out of the woodwork and into each others' line of sight and gives you a bit of a bonus for doing so.