Yeah but again, that was the glory days of 13/bbl oil (when it crept gently up to 35/bbl it was called an unsustainable bubble LOL!) and revenue was pouring in with massive business traffic and mind blowing walk up fares, that were actually being sold. The inherent inefficiencies of RJ's were largely masked during that time because of insanely low fuel (those days are gone forever...worst economy in generations and oil hovers in the 70's chomping at the bit to rise at the slightest uptick in economic indicators) AND revenue was bat dung crazy high.
The low operating costs (despite the sky high CASM even considering gas was almost free) made RJ's a nuclear weapon against any competitor that didn't have as many as someone else did. Hubs were raided at will and high value customers were poached left and right. There were even some seats left over that could be fire sale dumped into the burgeoning search engine market as pure profit since only a few high rollers subsidized every other seat's costs.
The "RJ revolution" was only partially about RJ's being jets. And even that part was comparing ratty little tubes some without lavs or flight attendants, APU's and in rare cases even pressurization. Not all "feeders" even gave full or in some cases any mileage credit. It was a radically different era.
Factor in today's so called "low" fuel prices (and tomorrow's higher prices) and quantum leaps in comfort with the Q series and new ATR, etc plus the fact that far more tickets are bought from the web with the lowest fare, to the billionth of a penny being the deciding factor, and I doubt very many people at all are going to actively choose to fly a given airline just to get on an RJ. Take a row out of the Q and give them industry leading leg room and put a TV in the seat, and most of the few who cared enough to switch just because of the two cans on the back will change their minds.
7x/bbl is the new norm, and if the economy roars back, 1XX/bbl will be the norm. The cost spread/CASM/trip cost of RJ's is crushing compared to "next gen" props (so to speak) on a LOT of routes currently served by RJ's. There will always be RJ's, but there is a lot of room to draw the fleet down over and above the massive culling of the 50 seat fleet that we're seeing.