You will never know what would have happened, if there wasn't a Last Life at least, but, to be honest, I don't think Yoshiki would have talked to Toshi even without the Last Life. May be Toshi would have grabbed earlier the chance to talk to Yoshiki, yes. But in the other hand I'm also not sure of this since I read how Toshi reacted when anyone from the X management came to talk to him... which in that case is possibly also the conclusion that with the Last Life he was somehow "thrown out" of X....
The fact, that the Last Song and actually the Last Life as well is pissing me off is, because in the first line Yoshiki didn't want it! And no matter what others say - and I know there are many fans who love the Last Life - in my eyes it is just shit!
In that case I even don't care about cultural differences - to me it has an affect as if the end really was forced, and the fact, that Yoshiki still said and says "X is my life", it makes the situation even more hurting, because the Last Life expresses the 'end' end which never should have happened - no matter if it was a final end, or just a stop to go on later.
And it's just a feeling, but I really believe that the reunion will happen.