In my view, there are two points to the retro-clone movement. One is "feeling" or "style". Personally, without a radical departure in rules, none of which the retro-clones provide, I think style is mostly up to the DM. I'm never going to be comfortable running urban adventures. I love dungeons and quests, and my games are always going to involve dungeons and quests. They did in 1e, they did in 2e, and they did in 3e. If I ever play 4e, they will there also. unfortunately, this is also the most advertised point, and people who play a retro-clone hoping for a magical style experience may be in for a big surprise. A sucky DM is a sucky DM, no matter the rules (or simpler rules may make it even worse!)
Second is the mechanics, or the game rules. The 0e retro-clones (ie S&W) are radically different creatures from 4e. I like the simplicity and the easy customability. It's not a "worse" or "inferior" game than 4e, it's simply different. I don't have a problem with the two existing side by side.