People will mine whatever turns a profit. The market will determine what currency succeeds.
I just don't see how we can put buying/investing pressure on people if we don't have some sort of incentive to spend.
The only way to put pressure is either by printing more money (inflation) or giving a cut of lost/stored coins right back into the miners pockets (demmurage).
I must admit this concept of demmurage on a digital currency is a radically different concept. Normally when people talk about demmurage they are talking about giving money to a "third" party to keep their money safe from going missing. Instead of giving this money to the banks/stores/and any other third party entity, with a demmuragecoin we would be giving the money right back to the miners, literally fueling our economy, and never loosing a single coin.
And in the end it will still have the deflationary properties of Bitcoins that people seem to love so much, but it will come with a price.
It's a win, win for everyone.