240 blocks at those low rates may turn out to be longer depending on how profitable it is to mine them. Judging from the past with other block chains, solidcoins will likely have long difficulty adjustments even with 240 blocks per period.

All we can do is wait and see my friend. Currently SolidCoin has the world record for block generation over a 48 hour period. Going by my calculations and from what I have learned studying the networks it's going to take someone with a few million dollars and a personal grudge to slow SolidCoin down. People were saying after 24 hours it was dead, after 48 hours it was dead, and they will keep saying it until it has been proven. I wouldn't expect otherwise.
OR...
Market price tanks and then hashing power flees for the next month or two or three.
So far so good, yes. But given that miners will likely only stay while it is profitable, you will continually need inflow of BTC to the exchanges to pump the price high enough for miners to want to mine solidcoins.