If you want to stay within the "laws of physics" in this area, one should then conclude with that; *IF* this platform becomes successful, the price of the "fuel" (ethereum) *MUST* keep on dropping steady in price, or else the application-creators/runners will not be able to afford running their applications in a competitive manner.
This nonsense. If demand is higher than supply, prices will rise, but services will still afford it as etherium like bitcoin is divisible, with 8 decimal points. You argument is similar to someone claiming 21 million BTC aren't enough, even though we know we will never run out of BTC as there are plenty of satoshi per BTC
There is a pretty good chance the "purchasers" will end up doubling or tripling their investment if there is wide adoption. Even if there are 100 million etherium by the end of 2015, 1 billion market cap would mean profit.