First, I'm not sure that everyone needs to "get it" at a level that will carry them through to calculus or other higher math. That's a level of competency that relatively few people need even in our modern, post-industrial economy and yet we act like it is a national tragedy that not every student will go on to calculus by age 18. Second, I'm not sure that common core is really helping more kids get it. (And yes, to the defenders, this is an implementation issue). Because one of the key points of the common core math standards is to be able to explain one's reasoning and critique the reasoning of others beginning in kindergarten, math has become much more literacy-based than it ever was in the past. If you aren't good at reading and writing, even in early elem where some variation in ability is normal, you won't be good in math... the one subject that has historically been the refuge of bright kids who struggled with written language for whatever reason. We're creating a very one-size-fits-all model of education - recommended course sequences for selective college admissions as the new HS graduation requirements, crowding out technical and vocational education in the name of college prep for all, a math curriculum that hinges on language skills, leaving no refuge for those kids who are good at math and bad at English (which describes many of the engineers and computer science guys I know), etc. But what happens to the kids who don't fit that mold?
But what about the large number of students over the years who haven't been able to "get it" well enough to use basic math skills in their day to day lives? The adults who never learned and therefore do not understand how compound interest works and run up incredible levels of debt on credit cards? The adults who truly cannot add up their grocery totals to even a roughest image and have to put back purchases until the total is something they can afford? These people are definitely real, and in many cases it comes down to a lack of understanding. I tutored kids in high school who had never really grasped what multiplication was. No wonder they couldn't double a recipe, let alone work out harder problems.
As for the language skills, I think that's a total red herring. Kids who get math nearly always get the language skills needed to explain the math. Having greater English skills has not historically been particularly helpful with word problems when the math skills aren't there. Allowing children to view math as something that doesn't need any language skills might explain why so many engineers and computer science guys get away with not demonstrating any language skills, but any engineer or computer person who understands what they themselves are doing is capable of explaining it, though sometimes not to the lay person.