TIP = This Is Thailand
Thailand is a toypet of the US and the US will not downgrade Thailand into Cat. 2 and will not allow any downgrading.
When I fly into Thailand I can see so many security and safety gaps that any other country would have been downgraded years ago (see IND and PHI). But the US needs Thailand against their percieved war against Myanmar, China, Laos and even Cambodia (to a certain extend).
So don't expect any major changes to happen not until the government of Thailand is not anymore US friendly and only than Thailand will be downgraded.