For what it's worth... "PATCH is going to be the primary method for updates in Rails 4.0." http://weblog.rubyonrails.org/2012/2/25/edge-rails-patch-is-...
That's not intended to be a counterpoint. In the wild, many companies don't use Rails. :)
That's not intended to be a counterpoint. In the wild, many companies don't use Rails. :)
With that said, it looks like many do already support it (from the same article you linked): Apache, nginx, Phusion Passenger, Unicorn, Thin, and WEBrick.