The OP-1 was a revolution in a space where previously there was nothing, but neither it nor TE in general have had a big impact on the broader hobbyist or professional communities.

Accessible, capable, portable, and cheap was accomplished for hobbyists by (1) the generation of synths just prior to the first Volcas and Behringer retro-ripoffs, starting a few years before the OP-1 came out, and (2) the iPad moment. Self-contained and highly flexible but still fun was accomplished for professionals by (1) Reason and (2) Octatrack. Quirky jams on the go in an expensive statement piece is accomplished by modular.

The Pocket Operator series suits some of the writer's arguments better, but those didn't pop off. The OPs and the modular starter kits are, more than anything, stunning design pieces that appeal to tech prosumers with an interest in music who lack experience outside the DAW. But even then, you can get more functional pieces with similar curb appeal from companies like Elektron and Critter & Guitari.

In my anecdotal experience, most everyone who buys a Teenage Engineering synth uses it for a month or two to record about an album's worth of demos then either leaves it on a shelf or sells it to get something else. Compare to something like the Volca Drum which has become a staple in the community as far more than a toy (for a great album heavily featuring it, check out Crush by Floating Points).