Also, this isn't taking token sales mainstream, token sales are already mainstream. This is making token sales available to the privileged (accredited investors) before they are available to the public.
It's very plausible that there could be a bubble, but just to give some context, the cryptocurrency market is valued at $68 billion dollars. The Bloomberg US Internet Index went from $2.948 trillion at its peak to $1.193 trillion. We are nowhere those types of valuations.
But no, you see, they are worried about SEC compliance. Aren't you glad VCs are looking out for your interests?