Hey
MM, what's up?
This is the entertainment business, where it doesn't always pay to wear your heart on your sleeve. Sometimes, playing hard to get is in your best interest. I'm also sure that Viggo's agent would caution him against emotional displays at this point.
Imagine that he gushes about it, then they end offering the part to someone younger, then he looks like an idiot and gossip columnists bring it up for at least a week (and it goes into his file, and everyone who writes a story on him from now until doomsday may mention it).
Viggo is also... different. A friend of mine did an interview with him and the report on him is that he really is a very calm, chilled-out guy. So it makes sense.