I was a long-time holdout for landscape-mode physical keyboards. I owned the original ADP1 from Google, which had a decent keyboard. I then upgraded to the Samsung Sidekick 4G, which had an even better keyboard. After fixing the keyboard map, I installed a cut-down Debian userspace on it for mobile software development.
After that, I looked at buying a Motorola Photon Q, but I would have had to hack it to get it on my preferred carrier. Even then it would have been expensive. I think my next actual phone was a Nexus 4, and I eventually got used to swiping.
For overall typing and mobile software development experience, I've instead settled on relatively small and handy Chromebooks. This is even easier now days, because installing the Linux development environment is a few clicks.
I knew they were wrong, but I figured there would at least be a permanent market for some 5% minority who needed their chiclet keyboards. Wrong!
Honestly surprised that a device took so long to come to market… I’m not making any predictions this time.