Sure upgrading to Ruby 1.9.x is a hassle (character encodings, changes to array class, etc. does break some old code). That said, 1.9 gives a good performance boost that Ruby needs, so man up and just do it.
It is also a "public good" issue: the sooner everyone up-converts to 1.9, the easier it will be to develop with Ruby because all required gems will work, etc. I have whined quite a bit on up convert hassles on rubyplanet.net, so I do understand the author's pain + complaints, but we do all need to move forward.