I have worked extensively with Smalltalk, I know it quite well and it's my favorite language. I made SqueakMap and several other packages for Squeak. Still, it's not as simple as it can/could be, especially not the meta model. Alan Kay himself has the same feelings AFAIK.
Do you have anything specific in mind about how you'd simplify it while keeping the overall experience? That's what I meant by the question.
Far as Kay, he's been building things on LISP's and Ometa-like languages in STEPS that I was aware. Given that, Im not sure how much he really believes im Smalltalk these days. Maybe he's implemented new Smalltalks that I just missed.