Well if AI takes exponential growth in processing to maintain linear growth in utility like the artificial proposes the amount of processing power on earth will quickly not be enough without exponentially more transistors that’s just math.

As far as quantum computing quantum supremacy has yet to be demonstrated, also so far increasing the number of cubits in a quantum computer looks like it’s going to be exponentially more difficult as you increase the numbers nullifying any gain you get from quantum computing this is definitely not certain but all that is to say the “Singularity ™” is also definitely not certain.