Ah, so the referendum isn’t then scheduled for a date in short order if the requisite signatures are collected but held at the next regularly scheduled election? Fair enough.
Each will have 1-4 issues (approx) scheduled. Elections for politicians happen every 5 years, but no need to wait for those. What takes time (for votations) is the process: you have to verify the signatures once they're handed in at the federal chancellery and then decide when to schedule it.
I like the sound of the upside a lot though.