Will there be? Almost certainly. The last hole-proof operating system written was EgyptOS and it was chiseled on stones.
Will someone find it in a few months? Are those the odds you're looking for? Beware falling Martians - the odds are better. Finding a hole to use to root any particular ROM makes climbing Mt. Everest not much more difficult than sleeping. There are tens of thousands of lines of code and one single typo may be the way in. After you study the first few hundred lines, they all begin to look the same - a gray blur. So you study a function at a time, for a few days. Thousands of functions. And if you know Linux really well, you know what to skip because it has nothing you can use. But it's still not a weekend's work. Or a 70 hour week's work. It's either walking from New York to Los Angeles on one toe (IOW, slow painful plodding), or a stroke of luck.
I've been writing code, including operating systems, for 40 years, and still stand in awe of people like Geohot and Hashcode.