Is it possible for another of Earth's species to catch up and overtake us technologically over the next million years or so? Assuming we survive that long as a species and our technology stagnates along with our biology, but our population reduces to say 20 million people. For example; if an isolated group of octopus evolved to become semi terrestrial (it would be basically impossible to develop chemistry, metallurgy etc under water), is it theoretically possible for them to increase in intelligence, develop tools, have an agricultural revolution, develop written language, have an industrial revolution and etc over the next million years or so.
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The first question is, are humans still around, retaining their technology. If yes, then it is extremely unlikely since humans already around. Any new species developing tools would be first investigated, and later possibly integrated in human science.
If humans are not around, the earliest reports of stone tool usage are 3.4 million years ago. So this is the timescale to look at for a new species to get to our current technology. This time can of course be shortened, especially if the newcomers bootstrap themselves with knowledge from humans. On the other hand, they might be hampered by depleted natural resources from humans, oil might be scarce for them.
Your best bet for someone overtaking human technology would be some sort of human created AI, or gene engineered superhumans, or whatever creature is experimented on should we ever figure out what actually causes intelligence.