1- while powering down you receive 104 payments. meaning a payment each week and not a full payment 2 years from now.
2- I think that the price of STEEM is like any crpto- currency bound to supply and demand. If we look at the demand part then the more people flock in and use Steemit the demand will rise. It's a safe bet that we can see high demands.
As for the supply part it's kinda tricky because the STEEM that a created are in the form of SP of about 800 per minute meaning and also users can power down or power up to or from STEEM. meaning that the supply side is very hard to predict. The incentives of the are working behind the scenes are that 90% of the supply will be held in SP.
here is a quote from the whitepaper:
"The price of a digital commodity, like STEEM, is driven by both supply and demand. If new STEEM is allocated to those who are holding long-term then the increase in supply is offset
by the corresponding demand to hold. The impact of this change in supply is postponed
until a future date when the long-term holder decides to sell. The sell pressure is then
distributed over 2 years.
When a long-term holder decides to exit, the supply of STEEM on the market will increase
and push the price down. This downward pressure is countered when a new long-term
holder decides to buy up the STEEM and convert it back into SP. We can therefore conclude
that the price will mostly be impacted by a change in demand for holding STEEM long-term."

For now we don't know if the incentives holds true, back at May 98% of STEEM were in SP. But many things can change. There can also be a whale who start to power down causing a flood of STEEM to the market. this whale needs to be countered by other long term holders.

The comment is long, but I tried to show people how they should approach analyzing the STEEM price, it's not that easy to predict.