Welcome to the 1970s? Solar panels + some kind of high ISP, extremely low thrust engine (used to be ion engines but apparently casamir effect thrusters are much better) have been planned ever since.
The problem is really simple. It's cheap to study a potential space travel mechanism on paper. But you cannot make any real progress unless real hardware is built and tested in space. And that costs a fortune, because a kilogram in space costs about $10,000 to get it there. Not to mention costs other than money, such as time and launch windows and delays and so forth.
SO...a rational person at NASA, if the organization was not at the mercy of Congress for every project, would dedicate ALL of their budget to getting that $10k/kilogram cost down to something affordable. Even if this took a large up-front investment to solve this problem.
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