It would be a big production but I see it being as/more successful as the current 1990's MafiaRP.
I think to spice things up, we should add another MafiaRP but it takes place in the 1920's-1940's era, where the Mafia was more feared and respected. When saying "Don" wouldn't bring suspicion, but fear. And there wasn't any bullshit street gangs, it was way more organized, turf wars were more common and disputes over power were an every day occurrence. It would be profitable as well, having a second server open. Custom clothing, PET Flags, etc.. It would be more for "Serious" Roleplayers, rather than minge idiots that go around blasting Limp Bizkit and Tay-K through their mic. The only "downside" (which I don't see personally) is having less diversity with ethnic factions. Around that time it was mostly/strictly Italians, Irish, Chinese and sometimes Black Crime Groups. This is most likely gonna get denied (because who want's to manage two servers?) but it would add reasons for more staff, more money, and more roleplay.
Finding/making a map would be tough as well. Same with finding prop packs for stuff. But I personally would rather have a 1940's MafiaRP than a 1990's MafiaRP.
I love MafiaRP anyways.