Unfortunately, SE seems to have little interest in the Chrono games, to say nothing of their development teams long moving onto other things - the fact nothing ever came of the third rumoured game is pretty clear SE are not interested in it too much.

It's also not helped that crossover events in FFXIV seem to be connected to current titles due to be released or recently released, or intellectual properties that have some personal connection with Yoshi (I mean, we haven't even had a FFVII crossover event yet and FFVII is apparently Yoshi's personal favourite FF title!), so sadly the chances of a Chrono series crossover are practically zero I'm sorry to say. ; ;