Who gets to say that they are no longer abiding by it? You may think that they don't. I may think that they don't. They say that they do. What makes us right and them wrong?
At some point it becomes patently obvious that the government no longer gives a damn about the Constitution. We actually crossed that line a long time ago in this country, but there's admittedly enough of the document remaining that it's worth staying in the Republic and fighting for. But that won't necessarily remain the case in the future. That's true both here and in the EU.
In both places, the government is importing new constituents for itself. In both places opposition to this practice has been either criminalized (Europe) or suppressed via soft totalitarianism (America, where you can lose your job for not “celebrating diversity”). We're a hate speech law or two away from having it criminalized here, and possibly one Supreme Court justice away from having that law upheld.
Just how far to the left does the government have to go before you'd agree that it's now broken free from the chains Jefferson hoped to tie it down with? It seems to me that the only thing that would light a fire under you would be if the government moved to the far right (which ain't gonna happen). But as long as it's moving steadily leftward, getting bigger and usurping more authority, ignoring the law on certain issues (illegal migration) while over enforcing the law on others (equating conservative single issue voters with “terrorists”), you'll just meekly go along and say that the government is constitutional because it says it is.
Some of us simply foresee a day when there are only a few conservative pockets left in our nation, thanks to mass immigration and the use of the schools & media for political indoctrination. We might seek our peaceful leave from the nation at that point. Do you seriously believe that a liberal Democrat government locked into perpetual power by an imported, dependent, and imprinted 60% of the electorate is going to abide by the Constitution? "Gee, Nancy, we can't pass this law, it might violate the Constitution." As someone told you earlier, wake up and smell the coffee.