Netflix and other streaming platforms have made inroads into anime production committees, but you are correct in that so far very little overall impact is seen in the industry. The Japanese domestic market is still the chief driver of demand for new anime, and success overseas doesn't seem to really inspire a response from most of the anime industry. I wouldn't say they're "isolated", since the market has been penetrated by the west, it's more like they're indifferent to western money.

I think Aniplex is in a position to change this, but the difficulty is going to be luring the studios since money doesn't seem to have as big an impact as one would expect.