If the rebuttal is "yeah but advancements improve the economy" -- The private sector can fund projects which are opportunities with an economic basis, they can take the risk and they can see if it is profitable in the market (ie beneficial)
If the rebuttal is "How will America stay competitive?" We cant seem to keep trade secrets anyways. [1]
[1] - https://www.bbc.com/news/world-asia-china-64206950
Edit: Also the 4 years at a time thing is probably a better choice too, because it makes them less twitchy politically. You get your 4 years, regardless of who's team is in office. This should be a win regardless of your affiliation.
You've inherited a nation built atop research which, at the time it was done, had no immediate pathway for economic viability. The groundbreaking research out of Bell Labs and DARPA provide many examples, among many more from other institutions, to support this claim which changed the entire world in addition to our nation for the better.
To think that this research would have been the product of economic incentivization is folly.
We, as a nation, have been spoiled by these gifts of our past and, like so many spoiled trust fund children, are flushing our inheritance down the toilet.
Investing in research towards creating digital computers and a global messaging system are pathways towards economic viability.