He had acute kidney failure, pneumonia, a bleed on the brain and severe nerve damage. Not simple Dengue fever. I'm sure it just didn't happen instantly during the taxi ride.
Old saying - you only get what you pay for. It may have been his choice to go to Bangkok Hospital. Government hospitals are hardly comfortable places to recover from any illness. Overworked and underpaid staff. Most care for patient care is handled by the family
It will do nothing but add more smoke & mirrors to make it look good. I've been a volunteer teacher in Isaan for close to 20 years trying to help Thai teachers teach English. I've assisted in numerous rural schools over the 20 year period (primary - secondary levels). There are many problems to overcome but the primary one is the lack of anywhere to use English consequently students may learn in school but quickly forget once they leave the classroom. Once home they typically speak Thai or the Isaan dialect with their family/friends. Granted there are a few students who like the English language and will increase their proficiency on their own using free online resources like YouTube etc.
One should remember that Bangkok schools & the rural Isaan schools are no where near the same. Rural schools lack resources and quality teachers who can speak English much less teach it. Teaching equipment which is broken will typically lay in a pile under a stairwell due to a lack of funds to repair it. Many classrooms are still relying on greenboards with chalk with little by way of more modern teaching equipment and the list goes on and on.