The market seems so small in 2021-2022 in fact because so many models have already been shut down. That to me is a strong indicator that the PHEV transition window is already closing and anyone thinking about it in 2022 is late to the party. GM has very explicitly stated that about the Volt, it's PHEV model that pretty much exactly met this transition window, starting in 2010 and being discontinued in 2019. GM concluded that the need for a transition vehicle was over and people were going to buy pure EVs moving forward.

(Anecdotally, as a buyer that invested in a Volt in 2011, I feel the exact same way. The Volt was a wonderful choice for 2011 but in 2022 I see a lot fewer reasons you wouldn't just buy a full EV.)