How exactly can OO be "shoehorned" into a language which is already OO?
Though the people who 'get' prototypes swear that they're the greatest paradigm ever you will still get a huge amount of people coming in from other languages which find the prototype chain awkward and prefer to think in complex class hierarchies.
These people who choose to create their abstractions out of classes are in no way 'wrong.' To each their own.
Adding `class` syntactic sugar is just standardizing on something which many people already do every day.
In that case, his opinion on class vs. prototypes is that it misses the point: http://lists.squeakfoundation.org/pipermail/squeak-dev/1998-...
As an aside, prototypes are strictly more powerful than classes, so they're no "shanty": http://web.media.mit.edu/~lieber/Lieberary/OOP/Delegation/De... (esp. section 6)