The same was said for anyone versus IBM, then anyone versus Microsoft for almost 2 decades after that.
Each time a new challenge was able to enter and stay in the fray, it was by capitalizing on a paradigm shift; mainframes -> home computers -> smartphones..
I think the next frontier may be ubiquitous, always-on AR/VR. If a new company makes that happen before Apple or Google do, they might have a chance.
If we got some dark horse contender that wasn't taken as serious for long enough to let it gain an advantage and/or was established or large enough that there wouldn't be a lot of pressure to sell, maybe. Nintendo/Sony/Microsoft are the current contenders for that in my mind based on that criteria (with Microsoft actually aggressively pursuing it). Any other company that makes a good showing is likely going to be someone else's next meal.