Well, this period it's the beginning of the end for Thai tourism. For many reasons that have already been mentioned, artificially high Baht, taxi mafia (really irritating), tuk-tuk mafia, double pricing (also irritating), increased prices for low quality product, rampant corruption, the stupid visa rules (90 days nonsense etc).
Even girl prices have skyrocketed, unless you frequent the Pattaya beach road, lol.
With the refusal of Thais to address all these issues and the emergence of the neighboring countries its just a matter of time to lose a substantial share of the market.
Thailand was lucky. During the seventies when Vietnam, Laos and Cambodia were suffering form the Vietnam war they had it fine. Not to mention what happened to poor Cambodia from Pol Pot. All these decades, 70s, 80s and 90s Thailand had all the time to improve. Now that the neighboring countries (with the exception of Myanmar) are catching up, the competition will become more fierce.
I'm already spending half of my vacation time in Vietnam, Ho Chi Minh and Da Nang. This summer I will visit Siem Reap to explore Cambodia. I will give a last chance to Thailand and if I'm not satisfied I will never return.