不清楚越南、韓國文字字母化的實際效果怎樣。。

The modern Korean script just doesn't look natural to me. I heard that there is a movement in attempt to restore the 漢字 script.

Romanization of the Chinese script automatically sounds like a dumb idea. A mature script is that to which a collective whole of cultural activities converge. It isn't just a pile of symbols for arbitrary manipulations.