How is that relevant when XSEED could just not license the Japanese voice track? That's not uncharted territory for them, as they do it with Falcom's own games. Yeah, one of the major selling point for the Evo ports in Japan is full voice acting, but I doubt many would complain if XSEED just used the same amount of audio they're dubbing for the PC version of 3rd. It's not like XSEED would have to sell people on buying another portable version of 3rd.
We don't know the full context, but you can see that XSEED hasn't used the Japanese audio in any of Falcom's games, IIRC. Even looking back at the release of Gurumin, Mastiff also took the Japanese voices out to redub the game, too.
Tom has said on a number of occasions that the Japanese voices just 'weren't available' for them to use at all. So it may be something in the contract with the voice recording that prevents anything from being done- maybe a term in the contract to make it more affordable for a small company like Falcom. (Kondo has also stated that Falcom, themselves, would never be able to afford the recording work for something like the Evolution titles.)
Without seeing the voice recording contract Falcom has, we can't make any determination ourselves, unfortunately.
Are the games after this available on PC too? As in, not translated yet, but have a PC version.
FC, SC, and 3rd were originally PC games. They were developed before Falcom started making console games.