I tried the two FFT:A games, but they bored me after a very short while. Especially the laws system. Ugh, I can't imagine how somebody thought that was a good idea.

I think an actual sequel to FFT would make no sense, but I'd really love a "spiritual successor" with a similar tone. The Advance games kept the gameplay, more or less, but they're all "let's have adventure!" games, which is almost the opposite of the feeling the first Tactics game has.