I disagree with this - neuro-typical does not necessarily mean the majority, it just means that it is the way of thinking, behaving, reacting etc that society is set up to work best with.
A relevant comparator is the way that much of the society, at least in the western world is set up to work for white men, even though they are not the majority.
The problem with neuro-divergent is it is a catch all label for a lot of different conditions which are often co-morbid but aren't always. Most people just think ADHD or Autism, but there are a lot more that are classed as ND (dyslexia, dyspraxia, Tourette's, OCD) as well as a number of things that are currently classed as 'mental health' conditions, which I think in future, will likely be re-classified as neuro-divergent.
It may be that there is a majority of people that have ND, but that if you looked at each type of ND individually, no single one would affect more people than are NT.
A lot more people are being diagnosed as ND because of a range of factors, but is largely due to a pincer movement of late diagnosed women (I am a late diagnosed ADHDer) and better and earlier diagnosis of children
A combination of awareness, historical tendency for ADHD and Autism to be seen as something that only affects boys, the impact of menopause and perimenopause on ADHD presentation and an increasingly fast paced and stressful way of life which makes it difficult to just plough through is leading more women to struggle.
The increased ability of people to share experiences via social media, easier access to medical information for checking symptoms and increased openess around talking about perimenopause and menopause means women who may previously have thought their struggles were just hormones, are not only able to identify ADHD (or other ND condition) as a possibility but are supported to seek diagnosis and support.
The understanding of the condition from their own diagnosis then leads them to spot it in others more easily and suggest they seek diagnosis, or in the case of their children, push for assessments which creates what appears to be the current snowball effect of new diagnosis.
It works the other way as well - as more children are assessed and diagnosed due to increased awareness, their parents realise they have similar traits and then seek assessment, or at least deploy ND coping tactics even if they don't want to seek a formal diagnosis.
My hope is that we will start to move society to be more inclusive - certainly within schools and education facilities, so that those who are ND don't necessarily need a diagnosis, because the school is set up in a way that caters for all so that only the children with the most complex needs need additional support. I think making schools a lot more ND friendly will also benefit a lot of NT children.
I also hope work environments adapt as well - they have started to recognise mental health and menopause, so it wouldn't be a huge leap to become more ND friendly, without ND people having to declare their diagnosis and ask for accommodations.
Flexible working and home / hybrid working (where possible) as a given and not as a special accommodation, not just a recognition of work-life balance but an active enforcement of it (think more the European model of leave being sacrosanct rather than the UK / US model of people needing to be on call 24/7), as AI becomes more developed, using it to reduce working hours rather than make redundancies etc.
It sounds like an unrealistic utopia, but there will be a tipping point as more and more people are diagnosed or recognise how their brain works and some of those people will be in positions of power and influence that can change things.