With space costing so little and home connection speeds getting so fast... do we really need to prune our forums anymore?

I have a forum and I wonder whether I should bother pruning it at all. Ungzipped it is around 70mb but is it so bad if it were increase to 1gigabyte in the future?

I would love to never prune my forum allowing it to be one big resource with nothing being lost.

Can you guys please advise me on whether or not pruning should be done?