Predicting the economic future 20-30 years down the line is very ambitious, even more so because markets are changing faster then ever.
I don't think that trying to dig a place over this timescale, given this uncertainty, should be a justification to sacrificing a big chunk of your life -- very few companies can expect to survive so long.
So, basically, if you are not seriously rich by that time, the additional effort might not make a difference.
There are reasons to invest one's life into a business (loving what you do, belief in doing the right thing, adding to the world, etc.), but market forces should not be on this list.
I don't think that trying to dig a place over this timescale, given this uncertainty, should be a justification to sacrificing a big chunk of your life -- very few companies can expect to survive so long.
So, basically, if you are not seriously rich by that time, the additional effort might not make a difference.
There are reasons to invest one's life into a business (loving what you do, belief in doing the right thing, adding to the world, etc.), but market forces should not be on this list.