SEC is not created STO but SEC just release regulation frame work for that, It's a lot of number but the strict regulation in USA was creating a very bad situation for them all. Just try to hope there will be a market that will be free from manupulation that makes SEC can approve it.
If you hoping the crypto market is free of manipulation, I don't think the SEC will ever accept Crypto, because in my opinion the crypto world will continue to be manipulated by the big players
I believe they will definitely learn to accept crypto currency because it already beyond their control and since they have no major influence over it, they can only look for a way to come into the industry and align with it and I guess that is why they came up with the STO idea and to also fight against these ICOs coming up with lots of project that are not viable and affecting lots of investors that ought to have invested in through IPO.
10 years more of crypto, and I am sure the sec will also be fully into it no matter how stubborn they proof now.