Earlier quoted context omitted.
My point is not that Russia is going to overpower us. My point is that without significant second-strike capabilities like submarines, hypersonic weapons could destabilize MAD at some point in the next 100 years. Early detection becomes moot meaning that bombers and possibly some silos become useless. Also I don't know what a "boomer" is, do you mean submarine?
A "boomer" is slag for a nuclear missile submarine. Hypersonic missiles do not change the logic behind MAD which is "you can launch a first strike, but we can still respond with enough damage that it makes doing so untenable."
I am aware, but it renders a lot of our existing infrastructure useless which means we'll have to invest a lot in other second strike measures. Which is gonna cost a lot.