I don't think the racist sentiments will ever be appeased, because they want unrealistic solutions like deporting all the brown people and think the EU is to blame for everything and not their own local/national politicians screwing them over.
Since these racist sentiments in the population won't be appeased by any non-far-right party, expect the far-right to come into even more power and disrupt the institutions that should otherwise serve as safe-guard against fascism and bigotry. Then they most likely will ally their fascist cultural politics with the libertarian economics (because capitalism is amoral).
Since it's impossible to deport brown people who were born in the European countries, expect them to be treated even more as second-class citizens, dehumanize them through discriminatory laws that target them via dog-whistles, and stove them together in housing projects and ghettos even more.
That is an extremely simplistic, one-sided and to some extent simply false description of the situation.. Aside from the ever vocal 5% hardcore racists every country seems to have, people do not want "deporting all the brown people" but proper immigration policies that go beyond "1) let everyone in, even without vetting to some extent (which leads to thousands of people from safe countries roaming around that can't be deported because of the lack of deportation agreements with their homecountries) 2) witness non-functioning integration and rising crime rates 3) act as if nobody could've prevented this".
Once common sense immigration and integration policies are in place and start to work, the right will eventually lose momentan again and the pendulum swing back more towards the left. Or alternatively we can continue to pretend that everything is OK and call everyone else a racist/facist/bigot/any other buzzworld of your liking and then act surprised that the right keeps winning. And no, democracies won't be dismantled because afaik most if not all western and central european countries require government coalitions because no far-right party has any chance of having a 50% majority and no classic conservative/social democrat party is going to let others turn states into facist dictatorships.
Ironically the only situation where Le Pen could win was if she ran against a far-left candidate who denies immigration problems (+ more terror attacks with high casualty count/impact on public subjective safety). Thankfully that situation will not present itself as the second round will most likely see her running against center-right Fillon or center-left Macron.