Think I saw an off hand comment from someone saying that Honoka's voice actress wanted a break of the forever variety, but it could just be whining. Either way, eh... things gotta change sometime, and this is probably for the better. You don't want to turn into the franchise equivalent of a shambing zombie, right?
... Although I can be cynical and say that they say this is the final concert, but they'll have a bonus concert and cameos every now and then.
AND they made this live really hard to get into. You NEED to get the Limited Edition Blu-ray of the movie (¥9800) to get a lottery ticket for the rights to buy the ticket just like iM@S, otherwise you don't stand a chance of getting a seat. There's always the concert Blu-ray ;( I know I'll definitely be getting it.
... That's kinda evil, but at the very least, the number of people who could possibly lottery for a ticket will be kept a little small? I mean, it's a limited edition, they can't be like growing on trees or anything, right?