At this moment, no, definitely not. The Regressives are driving this bus.
However, I guess it's possible that regular liberal voices could regain a foothold if the blowback you're predicting comes to fruition. I suspect the bigger concern than the sanctuary city thing is the possibility that a Kanye West or some similar cultural figure created enough momentum for change. The Regressives have controlled popular culture for so long that it's their, uh, Safe Space. They can't lose that.
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Kanye isn't the first, he is just the most prominent because of the left's eagerness to tear him down & his relationship with Trump.
If you look on YouTube there are a lot of minorities speaking publicly against the left. I suspect that many on the left seen this coming and that is why we are seeing the assault on free speech on college campuses as well as on social media platforms.
Facebook labeling Diamond & Silk as far left on their profile is a prime example of that. The label restricts their content from full distribution to like minded individuals and makes it very hard for advertisers with a conservative agenda to find them.