Indeed, and as has been stated earlier, 4.7mm caseless ammo actually has a much higher cook off temperature than brass cased ammo. The problem with heat was with the weapon itself, a problem I honestly believe would have been solved by now if the G11 had entered wider scale issue 27 years ago.
Just think of almost any other service rifle on the planet and how much they've been modified and (hopefully) improved in the last quarter of a century. There's no reason the G11 wouldn't have seen similar changes.
No weapon enters service in it's final, best form. Look at arguably the most successful and widespread rifle on the planet, the M16. It's first incarnation was by all reports plagued with issues, and I know from personal experience the A1 was pretty damn woeful too.