Core went bankrupt once doing exactly what they want to do now. I think the concern users will be left holding the bag, again, is reasonable.

Pebble went out of business but Core is set up very differently. They have an incredibly lean team and Eric appears to have self-funded much of the HW and SW development before taking a dime from customers.

There's a chance that some awful fate will befall Eric, of course, but other than that I am not especially concerned that the new company will fold. Eric seems to understand what caused that outcome, and is specifically looking to avoid making the same mistakes.