Holy smokes, so you're talking HoF level only? Well okay, but then why even use the term elite at all, just say HoF caliber goalie.
Now, has Dostal played at an extremely high level the first few weeks? Yeah, that's pretty undeniable. Long way to go though.
Elite is the best or most skilled of a group.
It depends on perspective (or group being compared). If you're considering us everyday fans, beer league losers and blue collar bums in the equation, then obviously only the elite make it to the NHL. As in all of them. Even the lowest end NHLer would school the crap out of all of us.
If you're looking/comparing all-time NHL players to one another, the elite class would be Hasek, Brodeur, Roy...the cream of the crop best. They nearly always make the HOF. This is what I interpreted the OP was saying.
If you're only comparing active NHLers and considering their career numbers, I don't believe the sample size is there yet.