Yeah, SEPP is different from the ROTH IRA pipeline.
You have to think about the bigger picture with these things. These are tools of the middle to upper middle class. Harming them would rile up those masses much more then raising long term capital gains rates or anything else that hits the rich, which is where all the power and wealth is.
It's like hitting a beehive with a bat to get honey. Will it work? Yeah. But there's much more efficient ways to go about collecting revenues.
I wouldn't worry about SEPP changing, the ROTH IRA pipeline I'd be a little more worried about, but that's .2% instead of .1% worry.