I don't give GM credit for having any brains at all. They will keep the Bolt in production only until the Equinox EV is out. They thought that would be 2023, but they will soon realize it's harder than it looks to make an EV. In a few years they'll realize they need a Bolt-size vehicle again, then maybe the Tracker. Selling a non-Ultium vehicle won't sit well with the jugheads at GM and they won't bother to redesign the Bolt from the ground up to use it.
But I think until The Equinox arrives in quantity, the Bolt will be pushed hard, so 2023 should be fun for us Bolt fans.
I don't see the Equinox as a drop-in replacement for the Bolt. Here are the known lengths for present and future GM EVs.
Bolt EV 163.2"
Bolt EUV 169.5"
Chevy Equinox 190.4"
Chevy Blazer ~194"
Cadillac Lyriq 196.7"
GMC Hummer 216.8"
Chevy Silverado 233"
For comparison here are two EV versions of very popular small cars, both shorter than the Bolt EV.
BMW Mini EV 151.7"
Honda Fit EV 162"
The Bolt EV is 1.2" longer than the Honda Fit EV, but 27" shorter than the Chevy Equinox EV. I have the VIN of my Lyriq Debut Edition, I just don't have the car yet. It will be an upgrade from our 2019 Bolt EV provided my wife doesn't mind the increase in length of 33.2", almost three feet! It will barely fit in our garage, and is way more than we need. We've been amazed at how much stuff we've been able to fit behind the Bolt EV's rear seat when up, let alone when it's down.
For myself, my only interest in the Lyriq over the EUV is its allegedly superior sensing, which I expect will make it's Super Cruise more capable than the EUV's version. As soon as I can get a Bolt-sized BEV3 with Super Cruise I'll be happy to end my lease on the Lyriq, assuming we decide to go with it rather than an EUV with Super Cruise. The Equinox is too close in length to the Lyriq to justify moving to it from the Lyriq.
Our use case is a fortnightly run between Palo Alto and Pacific Grove, 180 miles of highway driving round trip on US-101. Since we'll both be 80 next year, approaching the age when your kids start wanting to take your keys away, we see Super Cruise as ideal for our use case. The more competent it is, the better.