You guys raise good points. I agree, that things will eventually change but I have heard the same argument for all of my five years here now. "You won't be able to ride a bike without a licence in the near future" always the same story, "in the near future".
Now would I make an investment in a bike that was tens of thousands of dollars that didn't have a proper green book. Not a chance, however both of the unlicensed bikes that I have cost me less that $3000 (for both) I have had them for a year now, I don't imagine anything will change in the next year at least, so if in another year, things change and I can't ride them anymore, then well they have had a good run and for the amount of investment I put into them, then I am happy.
Also the OP lives out of major centers so I image one year for a complete change of the current policy is a big under estimate. (In the major centers too for that matter BKK being the exception) Also the government is not going to sit around and let millions of baht go to waste, if a policy of confiscation is ever put in place, my guess is that there will be a side policy of getting the bike registered, legal and back out on the streets quickly and easily. The police force are not going to confiscate thousands of bikes nation wide and have them sitting around in government yards rusting. It is the same reason that little scooters that have no license are left alone. Who in their right mind would pay 2000 baht to get a bike back that is barely worth that and the police don't want a bunch of junkers sitting around taking up space and costing them money.
Thats just my two cents on the matter, I am sure a lot of people are going to disagree with me on this. But hey this is a fair and open forum and both sides of the story need to be told.
Cheers.