I'm actually not a fan of the short-term leases to pop-ups. They always seem like gimmicky PR box-checking to me, and in my experience they get very little actual use. And fully-subsidized space turned over to community organizations is only as good as the spaces' programming is, and that is often not good.
I want to see spaces for viable local businesses and organizations (think: "mom-and-pops" and upstart restaurateurs and neighborhood services), the kinds of place that would sustainably flourish if rents were a bit more affordable but get pushed over the edge by $100+ / sf leases.
That was my gut reaction a couple of years ago too, but let me clarify. There are two key distinctions I'm now making based on observations: 1) I am
not referring to pop-up
retailers, and 2) I am not referring to pop-ups as a single solution - they need to be part of a solution that also includes exactly what you're asking for (space for permanent tenants that are small/local businesses).
Regarding number 1: community organizations, arts classes, dance/music studios, poetry slams, etc. draw diverse people into a retail area who otherwise might not have gone to that area of the city. The people then buy some food and hang out, etc. It adds vitality to an area and brings people together (i.e., bridging class divides, etc). These applications are almost totally turn-key: these unfinished spaces are like black-boxes that would be expensive to fit-out for other purposes (and these community groups often have little money)...so it's a win-win. There are few other uses that are so cheap; fit-outs are expensive, but all a poetry slam needs are some folding chairs and a portable PA system.
Regarding number 2: I wholeheartedly agree with you that you cannot
only have number 1. You must mix it with what you're saying also. The whole point is to bring more people into the neighborhood, then give them local retail once they get there.
But I agree with you about the gimmicky/underutilized nature of retail pop-ups.