They might have opened the tunnel and added another one at the Tai junction, you will be able to whiz past Pattaya and go to Bang Saray or Ban Chang instead.
A lot of questions in the OP......
Will it remain as it is ? Absolutely not, it has changed a lot in the last decade why should the future one be different.
Will it become a different type of tourist destination. Yes, more emphasis on family destination, naughty boy entertainment available but less in your face.
Will there be as many bars and entertainment venues ? Fewer bars, more family and good-boy venues!
Will there still be plenty of girls available for sex tourism. I believe so, where there is demand supply will follow, but I think the 'authorities' will put the squeeze on reducing it.
Will Westerners and Thais continue to buy property ? Yes I expect so, the frenzy will calm but the market will still be there.
Will there still be as many ex-pats. If the rules do not change I expect there will be more... but more other nationalities.
Will it still be a relatively cheap tourist destination? Compared to where? I think it will be cheaper than many up-market places, but I still expect prices to rise further. But they can only go so far with the current pathetic infrastructure and 3rd world look.
Will places like AC, .become more popular for mongers ? I don't think so, the Philippines is a backwards failed state. I do not feel any desire to visit, I am sure others feel similarly.
Could it ever become a Gambling destination. Hard question, if opened up it might be given a go, I just don't think they can catch up with places like Singapore and Macau.
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As you say and obviously that statement answers most of the questions, change is inevitable, nowhere stands still. We have a progressive Mayor.
We have greedy snouts keen to be better fed.
Thai people themselves are changing, the place will too.