At the moment, I am mostly holding cards and packs. I have sold quite a fair bit of my SPS (into Hive) because I don't see how the value can go up with so much printing, from ranked battles, from brawl rewards, etc. If ever there is a crypto boom, SPS will probably go up together with BTC and all the rest of the cryptos, which means Hive will go up too. Looking at the SPS (against Hive) charts on Tribaldex/Hive-Engine, the downtrend has been pretty bad over the past few months.
There is a lot printing at the moment and not much reason to stop it falling. If you got the timing right between SPS and HIVE, it would be a pretty decent conversion. And yes, if there is a boom, everything rises, so it doesn't matter that much :)