CRISPR is profoundly difficult and expensive, and gets more difficult and expensive the more chromosomes are at play. Modifying mosquitos is much easier, and with the short generations (days or weeks instead of decades for humans) it's much easier to get the genetic changes to stick and observe their efficacy. We might get around to modifying humans someday, but it will likely be centuries before it is available for anything besides fixing lethal anomalies (and even then, it'll be a long time until that becomes consistently successful).
As a widely available, cost-effective treatment? Almost certainly not. We have yet to successfully genetically modify a human being and there's a metric ton of legal and ethical red tape to deal with before we can even try.
Not necessarily, but the advancement of the technology and refinement of the technique are not progressing very quickly and since it's so far away from human application, there's not a lot of money/investment in it.
thats not true. crispr gene therapy was just approved by the fda for sickle cell syndrome. the methods ability to change dna on living organisms is why its a big deal in the first place.