Taming, that (post #4) sounds like a plausible analysis. Other software folks have and still are confronting the same problem in getting the user base to update at the same time. Witness the reluctance of many (eg, corporations with thousands of workers at PCs) to leave Windows XP (or even 98) when they heard how bad Vista was.
At some point the Microsofts decide simply to stop supporting some past version(s). It's gruesome treatment of users but necessary for general sanity, including that of poky users.
BUT this wouldn't excuse Kobo as there haven't been that many hardware devices (is it 4 including the Vox?) or general firmware upgrades.
The failure of 2.0 to launch to general applause is no doubt disappointing not just to the Kobo folk in Toronto but the new owners in Rakuten Tower in Tokyo. Rakuten is totally into mass merchandising on a global basis (see
http://global.rakuten.com/en/), and with the launch of the KT (with ePub3) in Japan, was no doubt hoping to give the 2.0 KT a global launch.
Hopefully, Rakuten has put a lot of development resources at Kobo's disposal. Hopefully, that will result in a bulletproof 2.01, and soon.
Despite my disappointment, voiced in different ways in many threads in this forum, my humble opinion is that the KT is a good piece of hardware, just poorly served with software.
I think it would be good if Kobo and Rakuten marketing would stay out of our faces and off the homescreen for a while until things are working right!