Yes and no depending on what you think.
I'd reckon that a Dash 8 200 and 300 wouldn't be too different. The BAe 146s I reckon will be gone in two years or so when the leases run out. Various rumours suggest that the 717 and 146 will get replaced by the one type of 'regional jet' but no one knows yet what it will be. 737-3/4s will dissappear over the next few years as more 800s and possibly 900s roll off the line. 762s are supposed to be gone within about two years or so, the A330s are almost identical so no biggie there. If you wanted to you could add 744s and 744-ERs as well!
I reckon that eventually we're looking at Dash 8, Regional jet, 737-8/900, 767-300, A330, 744 and A380. Not much duplication in that. May even see the 739s replacing 767 capacity as it goes off to AO or something like that. It certainly seems like it is all being 'looked at' continuously considering the rapidity at which things change!
