It's not hitting 100TB in 10 years, at most it might be bordering 80-90 Gigabytes. Maybe in something like 100 years it would hit a terabyte.
it's that size right now.
if you keep a node going all the way through you're gonna be fine. it's the newcomers who are gonna start sweating at a download of that magnitude. bitcoin needs new blood or the node count will continue going down.