I absolutely DO NOT believe in "indigo" "crystal" "rainbow" or super-psychic children, or more accurately, I don't believe those things are inborn traits of certain special people, but that they are traits which ALL human beings have the potential for. Most people simply refuse to believe in or develop them -- despite experiencing aspects such as déjà vu (sometimes that's just remembering a similar situation, but sometimes it is remembering an important aspect of your life purpose, which I believe you knew before birth), precognitive dreams, a 'bad feeling' or a 'good feeling' or an urge to contact someone or knowing who is calling before you look at the phone or other things that are not considered aspects of intuition/psychic ability even though they are. The only children who are not "indigo" or "crystal" are those who have already been stamped into hiding those qualities -- through parents or peers who repress them. No child is born without these gifts, and no adult lacks the ability to draw them out and develop them.
Children are NOT "becoming increasingly more sensitive, aware, and psychic" -- adults are becoming more aware of these traits in children, and are starting to encourage rather than discourage them. Obviously those traits are going to be more pronounced when they are considered positive rather than negative; not too long ago being psychic could have gotten you stoned to death. Depending on how they liked the words I used, if I delivered a message from Spirit my parents would either have called it from God and been delighted or have taken me to a pastor to have the demon cast out. If they hadn't been charismatic (believing in prophesy as a modern gift) the ONLY solution they'd have seen would have been to have the 'demon' cast out -- and there are plenty of non-charismatic Christians out there.
I am wholeheartedly and fiercely equalist in spiritual matters as in everything else. Every single person is just as gifted as everyone else. I think believing in special gifts for a select group is elitist and serves to cause those who believe themselves to be 'gifted' to be lazy, as they feel they were born with their gifts and don't need to develop themselves, and it causes those who don't believe themselves to be 'gifted' to feel helpless and not bother to develop themselves because they think it has no point. Believing that traits are inborn rather than self-created causes people to stagnate.
I do understand the draw of the concept -- it is wonderful to feel part of a group, especially part of a group that is better than everyone else. But like all exclusionary groups, it divides more than it draws together. Instead of feeling a kinship with the whole world, a person who believes themselves to be "Indigo" feels a kinship with other "Indigos" and feels no kinship or a lesser kinship with the rest of humankind (or sees them as 'less evolved' and in need of guidance by the more-evolved "Indigos"). It's natural to be more drawn to people who are like you -- but deciding this on a group basis rather than an individual basis is discriminatory.