Having lived here for 20 years now, I'd say Thailand has been slowly going downhill ever since the coup d'etat that kicked out Thaksin in 2006... it has just detectably accelerated towards the China model since the last coup committed by the present lot that are in charge. Those above who have mentioned the clear change in the locals' attitudes and decline in carefreeness over time, are right, and the locals are hostages of the Amart. Back in 2000-2005 it was the end of the good times, but it was still party time and the famous Thai hospitality and carefree MO was there to see and enjoy... which is one of the main things that convinced me to stay. What bothers me is the direction it's headed in, which is the China model and you can see them slowly inching towards it to please Beijing (for numerous reasons).
If I was just arriving to Thailand now and thinking of retiring somewhere tropical, then I don't think it would be here. Thailand, in the future, is going to still be an okay place to visit for a short holiday, but living or retiring here will only be for the wealthy with money to burn as the requirements will only get more onerous as time goes by... it is easy to see how the screw has slowly tightened over the last 10-12 years. And with the entities in charge now, including Prayut's bosses, then I can't see anything lenient/positive/tolerant - or multiple other words to describe it - as coming our way... if anything, they have done their level best to get rid of as many foreigners as possible, which isn't a good sign.