Rollo Lawson
Banned
Well that depends on how far past Fallout 3 4 is set. If it's only a few years or even a decade, we still have 90+ years until that point. I know what you mean though.
Few years is spinoff territory. Both 3 and NV are really parallel sequels to 2 in the way the lore has been working. There has always been that lineage, tracing back component. A decade after 3 would mean only 5 or 6 years after NV. I just don't see anything significant added to canon if some generations don't pass. I feel like the trailer we saw is all either flash back or simulation.