[keanebean86]

Maybe they finally upgrade the 486sx based server everything runs on?

But seriously they could invest in some content discovery/recommendation features. There are probably a lot of small subreddits that go unnoticed by people that just check /all or /popular.

Their video player needs some major work.

They could decentralize the site. Shard off subreddits by some category system. The homepage would then be an aggregation of the shards. If the main site is down you can potentially still reach some shards.

Of course they would still have a ton of money left over. With a stack this high they could convert the office heater to run directly off cash for a few years.