I figure it'll get worse as Boeing and Airbus reduce the number of unique vehicles in the lines going forward. Airbus is down to only manufacturing the A320, A330, and A380. And Boeing was planning on having three clean sheet designs (Yellowstone) - the 787, a new 737/757/767 variant (pushed back due to the A320 NEO as they developed the 737 MAX to compete), and a 777/747 replacement (likely the 777X). They'll each have variants but they'll probably just be variation in fuselage length for variable passenger capacity to keep costs down with a common wing.
Not sure how either companies will want to do things since you need that engineering knowledge on the next aircraft and if you're going through that process less frequently, you'll have fewer seasoned folks that know what they're doing. Oh well.