Its only a matter of time before our enemies start using the same tech on their missiles, and our own missile defense systems will be useless.
The caveat will be expense its far cheaper to send in a single aircraft caring many non-stealth missiles than one stealth missile.
Arguably, the time is here.
Russia has the P-800 Yakhont that has all the good stuff, and flies faster than Mach 3.
It is fairly certain that it will perform as advertised, as it was developed as a joint project with India and Germany (they call it BrahMos).
They are Thermonuclear capable, can talk to one another, swarm attack and change target and tactics mid flight.
Very hard to beat.