[dakics]

Unity's multi-platform track record is quite solid at this point in time.

I wouldn't bet on exotic Java attempts of "write once run everywhere" though.

[kuschku]

Java is actually not that bad – Java with LWJGL gets you within a factor of 1.6 to C++ performance, while actually being "write once run everywhere" (for PC, at least). That’s good enough.

[karmadog]

Maybe on a Hotspot VM with JIT, while using frivolous amounts of memory for good GC performance.

You're not allowed to do JIT on consoles or mobile and you're memory constrained. A PC-only game engine is going to be a tough sell these days.

Also, unless you're bundling a JVM (not sure about the legals here) you have to make your Windows (i.e. primary) customers install the obnoxious Oracle Java runtime.

[treehau5]

there's actually a pretty serious niche of us Go game developers growing as well

[pjmlp]

I look forward to it.

[thehardsphere]

Yes, the track record is often negative if you want to make action games on not-Windows because of GC pauses caused by Mono's inferior garbage collector.

As for Java, Notch managed to do it for Minecraft, except for the mobile port which I think I remember reading was re-written from scratch on iOS because the performance was terrible.