The problem as I see it is the TA's role in the current model of 'inclusion' premised as it is on:
-inclusion in large classes
-with teachers who often know very little about SEN/disability and are unable to naturally make reasonable adjustments without those adjustments being compelled by the requirements of the statement. Not blaming teachers - but how many have in-depth SEN training??
- in a school system that is, perhaps understandably, built on a model of compliance in which all children must do the same thing all the time and if they don't, or can't, then they lead a different life with a TA
This creates an 'opt in' or 'opt out' model of education - exclusion within an inclusive environment. A child is either in the class or out. Either doing PE or not etc etc. With a TA or not.
A TA is supposed to create the flexibility to bridge that gap between the child and the peer group and encourage the development of core skills but, in my experience, this seldom works because TAs may not have the skills,training, understanding or support to address this. Or perhaps, sometimes, it is just not able to be addressed.
Further, teachers routinely abdicate responsibility to the TA rather than work out how best to apply their support.
My son has been supported by a TA and a teacher (acting) working as a TA and both experiences have been absolutely dreadful for him. He is sensitive to being treated differently and the school model just doesn't work for him.
However, I think that if more flexibility about being in and out of the classroom had been present earlier on, and properly trained staff had been available, than he would have had a chance of integrating.
At the end of the day, TAs can be absolutely vital at helping children manage mainstream schooling but the model on which they work (a dump and run model of delegation) is frequently why it also fails.
Smaller class sizes, more teachers, less TAs and more flexibility is what would help make inclusion work.