They make a big point that PHP is the language of 2000s decade and Ruby is the language of this decade. Is that true?
I call FUD They do say Facebook is from PHP and Twitter is from Ruby. Ruby provides alot of built in shortcuts, but has issues with scalability. With all their millions I still get that "Twitter is over capacilty" message a few times a day - w/as I alsmost never see Facebook down or even slow (even back when they were no richer than Twitter is now). Wikipedia regularly serves over 60,000,000 unique visitors/day on a shoe string budget.
Anyway, Ruby doesn't make a good Rubric designer module, to do that you need a team, time, and a budget, with an educator to say what and how it should work, a system architect and UI designer to create a mockup and specification, coder(s) to build it as close to the design spec as she/he can get in the number of hours they can afford, and a project manager to keep the whole thing on track.
The hard part is not choosing the "right" server side scripting language, most of the front end 'oooohs', 'ahhs', drags, drops, shades and fades are fron AJAX toolkits like Dojo and jQuery that work happily with PHP, Python, Ruby, even asp.NET. The hard part is getting a good team together and keeping them funded and on track from start to completion. O and good coffee, keep it coming.