Manufacturing has gotten really really great in the past 20 years. My 2000 superduty has only had one major failure and that was when the fuel pump died at 208,000 miles. (and it stranded me in my garage, so that was nice) Stupid things that used to come apart last longer, power windows and locks, interior etc has all gotten better. (my 5.4L SD has 224,000 miles now and is original motor, clutch, tranny, t-case, wheel bearings, axle seals, alternator, the list goes on, it is hella reliable) The fact is that there are more and more of these vehicles going 200,000 miles with no real problems. Not just Fords but all vehicles.
Back to the topic of new motors, the increased efficiency is great. IMO Ford has always led the truck market with engine control, by 1988 all their full size trucks had multi-port EFI, by 1998, all their gas trucks had OHC, and distributor-less ignition, also ford had the first trucks with variable cam timing. Things like this have caused them to have reputation of releasing technology that has not been proven and things like the EEC-IV class action suit happen. This seems to be a completely opposite of GM, but the advantage of GM is the parts for a 350 will fit a 350. With ford parts for a 302 will not always fit a 302, you gotta figure out what year and what plant the motor came from...
In 1992 the ford mustang had a 302 CI push rod motor with EFI that was advertised at 225hp and 300lb/ft of torque, in 2012 (twenty years later) the mustang has a 5.0L with 420hp and 390lb/ft of torque. The gas mileage is similar, but an increase of almost 100 hp and 100 lb/ft is pretty damn good. With push rods and carburetors I thought the goal was to get 1 hp per cubic inch, today manufactures are doing much better than that with stricter emissions.
Side note, I think it will be a long time before eco-boost swaps become common. There are not a lot of transmissions it will bolt up to, that motor is really built for the transmissions that are offered with it, (so no manual with a 4x4) throw in the 2000psi fuel rail and it becomes pretty complicated to just throw one in a jeep or muscle car, it is nowhere near as easy or cheap as throwing a vortec 350 in a vehicle. I am not saying it won't become a common swap, I am just saying that it is a long way off. I think the new 5.0 will be more popular. It is already available as a crate motor and stand alone PCM. Also there are a ton of great transmissions that will bolt up to the MOD block. (ZF 5peed... mmm synchronized granny gear) I have never checked but I would guess that the SD t-cases are interchangeable with with ford t-cases back to the late 70's (np 203/205 which would allow an easy way to do a passenger side drop front axle )
hmmmmm
talking about ecoboosts.... that stayed on topic
nathan