This. I feel its the best and fairest way forward for all concerned. Those who wish to participate in the Curia can then, and those who don't (which is lets be honest most 'Citizens') don't have to, and also don't have a public body (As opposed to staff) with authority over them, who they haven't themselves mandated and endorsed.
It might also make the Curia's rep improved- as a more 'elitist' closed-in system for those who like Curial stuff would drum up interest 'what do they do in that corner over there, always huddled around a magazine?' while those who received citizenship as an award for their contributions (Like i see it as anyway- i was never informed they'd be an extra governing body with actual power over me once i'd joined...) can get along in peace. I don't agree citizens should be held to some higher standard, because again it's an award.
The only real reason i could see is that Citizens were a recruiting ground for moderation, and so being held to a higher standard was entirely necessary, of course now we can choose the most appropriate candidates for a wider pool, so there's no real reason Citizens should be better behaved to be honest.