Hell, the field of rocketry was itself started by dreamers. Tsiolkovsky and von Braun weren't inspired by ambitious things, they dreamed of ambitious things, and helped made them happen. Goddard reportedly credited Wells[0] as the initial source of inspiration; Tsiolkovsky was apparently moved by the works of Verne[1].
--
What we need, really, is more dreamers in positions of money and influence. People with enough money and political clout to move the needle. Because at this point, what's stopping us is no longer science, just the bank account, and some engineering work of the kind which gets solved when you throw money at it.
--
[0] - https://en.wikipedia.org/wiki/Robert_H._Goddard#Cherry_tree_...
[1] - https://en.wikipedia.org/wiki/Konstantin_Tsiolkovsky#Early_l...