Let's say you're a pessimist and you think that SPS will also drop.

SPS is already dropped. I remember when it was around $0.90 USD. Nowadays it is around $0.10 USD. Hopefully it will not drop down further. I also hope that it will even go up after the end of the SPS airdrop.

I am still staking all of my SPS. I have not sold any SPS so far, and I am not planning to sell any SPS until the end of the SPS airdrop either.