There's really no upside to continuing POW. Only downsides, lower prices, and malicious or unintended forks.
Upsides to continuing PoW, just for the sake of argument-
1. Continued free publicity via WTM/Crypto-coinZ/Crypt0-zone
2. More opportunity for small buyers to get in with less risk
3. Far easier to build a userbase and community via mining than staking.