He's saying that he thinks it's likely that Miller wins a title soon and then adds another one or two down the road - that's not an unreasonable prediction.
It's hard, but if you're looking forward and predicting which young coaches are poised to do such a thing, if you get past the top one or two without getting to Miller, you're doing it wrong.
In the history of MCBB there are very few who have won 3 (that's what you get when you add a "soon" title and "another one or two" down the road). Starting at age 45 with zero titles have to think only a couple of guys have done that starting there and they are named Wooden and Calhoun and only Jim did it since the 64 team format.
If I buy the "3 or so" over next 20 years for this guy, what is a reasonable prediction for Ollie who is a bit younger and has already won once? Also 3, maybe 4 which should be reasonable since he has already done it and is younger. So that's 30 to 35% of the available hardware for the next 20 years between 2 coaches; doesn't leave much room for Calamari, Izzo, UNCheat, ratface, Florida, Kansas, the Dribbler and the other 330 schools.
In about 75 years of NCAA tournament play only 5 coaches have won 3 or more times, and since the 64 team format in 1985, which is some 30 odd years, there have been only 4 SCHOOLS that have won 3 or more times and 2 coaches - K and JC.
As for likelihood of Pac10 teams winning it all, since 1985 a total of 2 times have a Pac10 team won it all, and both in the 90's. Not many coaches do like JC and win 3 of 4 appearances in final game. Guys like Izzo or K get to final 4 a lot of times to win a few. Izzo made 6 FF to win once and K made 11 FF to win 4; so Miller needs to get to 6 or 7 FF's in 20 years (really 12 if has 25% chance of winning once gets there).
So yeah, I think "soon" and "another one or two down the road" seems highly unreasonable for a 45 year old coach who has never won it all, even once.