Some people have crazy ideas, and the world needs that. However, trading in Ruby or Python or [insert favorite scripting language] for Objective-C to write server code is a foolish idea that's divorced from reality (with some exceptions).

The vast majority of server code that is written is bit plumbing. Moreover, it's written by not-so-great devs who aren't gdb experts. The performance benefits of C-like languages are completely useless for all but a handful of companies like Google and Facebook. Unless you're doing heavy number crunching server side (which most web apps don't), there's no discernable benefit to using Objectiv-C or C/C++.

There are plenty of benefits to using Java or a scripting language though. The reasons are obvious to anyone techie enough to get this far.