I am not sure about the Daily quests to increase demand, as I quite like these Focuses :D
However, in terms of supply v demand, I think that while there isn't the demand now, the release of LAND and how that is going to work will soak up a mass of those cards that are currently on the rental markets and for sale. Assuming that there will be benefits for staking better cards to land, a lot of those large holders will remove their cards from the rental market and stake to their land to generate instead - same for the trade market. This means that suddenly, there can be a supply shock of cards to rent and buy, driving prices up, but also affecting the playing users.
There are 150,000 plots and assuming each will need a summoner to operate, that is 150,000 summoners. But, production will also be affected by quality and combines etc. if for example everyone was to stake rare summoners at 115 BCX, that would take 17.25M cards (combined). Then, if the land requires a set of monsters, 1 common, 1 rare, 1 epic and 1 legendary, that would be another 60M commons, 17.25M rares, 6.9M epics and 600,000 Legendary cards. That is 5 cards to a plot.
At the moment, there are 3.5M cards on the rental markets. This means that it is possible that there aren't enough cards at the moment.
So, when you are talking about reducing supply, land does that and, it will also increase demand.
I hope. :D