I'm saying that the fundamental things required in order to launch gram-scale interstellar probes don't seem out of reach; that largely something close to the requirements could be made at great cost today, and making a mission practical is mostly about cost optimization and economies of scale.

I think largely whether we do it in 50 years comes down to whether we've wiped out a lot of our economic output by then with strife, and whether we still consider exploration worthwhile to spend a lot of money and reources on.