As a long time Netflix subscriber (maybe 10 years - going back to when it was 3 DVDs at a time for $14.99 and no streaming option) - I'd say the answer to the headline is "no."
Reed Hastings claims that high-speed internet streaming was always his plan for Netflix - they just had to wait for the technology to catch up. While they were waiting, Netflix had to fight off competition from Wal-Mart (Netflix bought them out) and Blockbuster (who probably wish Netflix had bought them out) in the "DVD by mail" space. When they first rolled out the "streaming" option, the movies available for streaming were not good (but streaming was a free add on - so it didn't really matter).
When streaming became a viable option, the big problem Netflix ran into was Netflix ("We have met the enemy and they are us"). They tried to raise the monthly fee and people bolted for the door (800,000 members quickly gone). Netflix said "oops!" and decided to split into two services (Anybody remember "Quickster?"), which people also hated - so we got something like the current price structure.
So, no DVDs are not inconvenient on purpose, and won't go away anytime soon. Netflix arrived at its pricing structure by responding to market forces. Streaming content is the future (and the future is now!) - which means licensing agreements with content creators/providers will surpass "hard copy" sales (if they haven't already).
...and if you are colecting marketing data for Netflix: I'm a streaming only customer. I "rent"/stream a lot of just released movies from Amazon.com (had a problem with the 30 day wait time for DVD new releases from Netflix - but if I could get new movies the week they are released on DVD I'd go back) ...