SPS and DEC are both on the rise again price wise. DEC more so as I think people are thinking they can not only build up supply of DEC ready for the new packs, but also earn more SPS per day in the airdrop. If that's what they are doing it's not a bad idea.

Vouchers are going to make this pre-sale interesting, I feel like people will be changing plans as they go along as who knows how much these Vouchers will sell for. If everyone is trying to hold onto them then the price could be high, or if people see them as a quick way to make some money before the Chaos Legion officially launches. We could well see the price for them to be low.
Just to throw another spanner in the works the Vouchers will be able to be kept for future uses unlike previous vouchers. This could see whales holding onto them just incase they need them later. After all like you said Lands are coming up and who is to say they will not be needed for lands.

One thing is for sure SPS is becoming very valuable and even just to play some tournaments now you need to have x amount of SPS staked. Who knows what the future price of SPS could be. At the moment the airdrop is actually working to keep the price of SPS some what down but the more use cases it has the higher that price will rise I feel.

Anyways thanks for posting it was a great read.