Liquidity is obviously a good thing for a currency, and on the surface this is obviously a bad thing (at least for Bitcoin users in Thailand), but it's definitely not the key factor to the success of Bitcoin. In fact, a lot of the driving force behind the Bitcoin community is counter-economics (e.g. black markets) and the desire for an alternative to government currencies. In that context, governments outlawing Bitcoin may very well be a positive thing for Bitcoin, because it could be perceived as vindication of the need for currencies which are free from governments.