I'm not completely competent when it comes to rtv vs nominate, Mani vs SM etc... but if there was a decent list of maps that the users (and not only the admins) could partake in setting up a vote
(i.e. from the maps that were listed in the other post regarding admins setting up votes: de_aztec, de_dust2, de_cbble, de_season, de_nuke, de_train, de_inferno, de_cpl_mill, de_cpl_strike, de_russka, de_losttemple_pro, de_contra, de_dust, cs_office, cs_militia, cs_italy, de_piranesi, cs_havana, cs_compound, de_port, de_prodigy etc...)
and then perhaps a regular vote selection if none of the players partakes in setting up votes (possibly one voted on in the forum like onyx was saying), I think that could help a lot...
People either complain about redundancy or maps that kill the server... If the players vote for a map but also have a say in which maps they can vote for it seems it might address both issues... would be odd if the map current players vote for drives themselves out of the server, but in that case it seems the regular vote selection would just return and bring people in.