Hi,
1) There's no real way to tell, its not something you can give a set time period on. Someone has to find an exploitable flaw that may or may not exist and then develop a way to use it to allow a downgrader to work.
Could be tomorrow, next week/month/year or longer. All are equally likely.
2) No, only a few really crappy flash games through the web browser.
3) It depends how much you value homebrew. Personally I would take it back and try to get another (say it shuts off randomly for no reason or something) if its quite new.
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