I feel like the next set of main stages we'll get will be the last for the area & will have a Mega Stage, considering we have, what, 20 stages now in this area? 30 seems to be the norm for each area that's been added in via update.
Though I'm guessing aside from the other Regi-Pokemon, we won't get much else new this week. Kind of would like new daily Pokemon again, though betting it'll be a repeat.
I think part of the issue is that when you're someone like me who has EVERYONE collected so far & a fairly strong team along with some Maxed out Pokemon, the new content won't be as good because it's be more for those still starting out, but haven't gotten to the levels with stronger Pokemon &/or gotten the EX stage Pokemon yet. But I still kind of agree with you, as I mainly just hope for new EX stages since that's where the better Pokemon are/worth leveling up.
Though yes, in the 3DS version, aside from getting coins to beat Darkrai lv. 150 a few hours before it ended, I have not spent a single dollar in order to beat the main stages or EX stages.