If we put the financial resources behind it, we (meaning: a very few of us) could leave the solar system right now. It's just that we lack the technology to do

If we put the financial resources behind it, we (meaning: a very few of us) could leave the solar system right now. It's just that we lack the technology to do it right, with minimal risk and a lot of comfort. This is an engineering problem which we could solve, but choose not to. Putting together a generation ship to leave the system would probably succeed, but it would also utterly consume all our resources. The reason for this is that we choose to suck at space. For all our achievements in other areas, our space program is basically still in the sixties. The main thing that is missing which would allow for us to even colonize the solar system, and potentially other star systems, is a good way to get lots of energy, such as nuclear fusion. There is nothing physically preventing us from developing a fusion reactor, we just haven't done it yet. Leaving the solar system will get even easier once we master the process of changing the substrate our minds run on from biological matter to something more appropriate, but again, this is not strictly required. FTL travel is not really needed for us to colonize the galaxy either. It would be nice to have, but at this point it's just beyond our means to think about it. The other stuff isn't, though.