* Can't go faster than light (or even a large fraction of the limit)
That's a valid argument against traveling to other solar systems for sure. We could still travel to any planet/moon in our solar system in easily less than a generation and probably no more than 10 years.
* Cost. Look at price per compute vs price to bring something to space and tell me which trend seems more durable. Things will keep getting smaller while space exploration may not.
Space will likely still be expensive for generations to come but reusability of rockets will decrease the expense of space travel by a couple of orders of magnitude. Imagine that we needed to build a new Airbus for each airplane trip, nobody would fly, it would be too expensive. Relative to rockets themselves, rocket fuel is cheap.
* Space sucks! Very inhospitable. I'd rather live in a biodome on a ravaged earth than mars.
I don't know if I'd want to live my life on Mars either. That doesn't mean we shouldn't explore Mars and beyond.
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That's a valid argument against traveling to other solar systems for sure. We could still travel to any planet/moon in our solar system in easily less than a generation and probably no more than 10 years.
Space will likely still be expensive for generations to come but reusability of rockets will decrease the expense of space travel by a couple of orders of magnitude. Imagine that we needed to build a new Airbus for each airplane trip, nobody would fly, it would be too expensive. Relative to rockets themselves, rocket fuel is cheap.
I don't know if I'd want to live my life on Mars either. That doesn't mean we shouldn't explore Mars and beyond.