Not true - at the time the Air was announced, both Mac Pros and MacBook Pros were really professional computers. Adding the Air didn't affect the professional consumer base.
Bingo! ...and after selling the original MBA (which was, frankly, a bit of an executive toy) to a niche audience for a year os so, they listened to feedback and produced the "modern" MBA, which (bar a few spec bumps) we know and love.
Yep and remember people's reactions when the first rMBP was announced. Previous one was thin enough, muh upgradability, etc.
...but also remember that, alongside the 2012 rMBP, Apple released new versions of the "classic" MBPs with up-to-date CPUs so that people who
weren't ready to dump their spinning rust, optical drives and ethernet ports, or pay the new higher price,
still had an option. Plus, their decisions on what to leave out of the rMBP were actually
sensible - in that it was becoming increasingly practical to leave your optical drive and ethernet port at home. Plus, in my experience, those slimline optical drives had a six month half life (esp. when it came to
writing discs) so, good riddance.
...c.f. today when Apple's only alternative to the "courageously" re-designed 2016 MBP was the chance to buy the
lowest-spec 2015 model, already 18 months and a couple of CPU generations out-of-date, at an
increased price... and the design decisions include such classics as "the most ubiquitous connector in the history of computing, the USB-A connector, is suddenly obsolete" and "20% smaller batteries in a machine aimed at creative pros is OK because the new CPU optimises power consumption for web browsing" or "sorry you can't plug in a USB flash drive, SD card or HDMI projector into your ultra-portable laptop without a bagful of dongles but you
can connect two 5k displays and two 40Gbps RAID enclosures... to the thermally-throttled CPU and mediocre mobile-class GPU".
...more or less ditto for the Mac Pro: wait until the old model is
thoroughly obsolete before "replacing" it with something designed for a different market.
Its not so much that the new products are
bad (well, maybe the keyboard is bad) its that, if they don't meet your needs, Apple don't offer any
choice - or if they do, the "choice" is to pay full price for year-before-last's model.