Options for someone laid off under a TN1 Visa

technically no. You're required by the conditions of the TN to leave the US immediately if you are no longer employed by the company that sponsored your TN.

If under extenuating circumstances such as kona's and you have to remain in the US for medical reasons, an extension of stay may be granted, but if you just want to stick around to see if you can find another job, no, an extension of stay would not likely be granted.

Yeah, I wouldn't want to try applying for change of status from TN-1 to B-2, I'm not sure that advice is correct. If you have a medical condition that is a different situation. People receiving medical care for a serious condition can stay indefinitely in B-2.

Bear in mind too that if you've already been in the country more than six months you can't re-enter in B-2 (or maybe you can, depends on the mood of USCIS but usually the answer is "no").

Welcome to my world, had the same thing happen to me ages ago. One of the reasons why work permits are a pox on humanity, IMO.