Syncing a backed up wallet

[mcgin]

So lets say I backup my wallet.dat file today (Let's assume it's done securely and only I will be able to access it).  And then disappear for 5 years.  When I come back can I simply point a bitcoin client at my wallet and wait for it to sync with the blockchain and my coins are still present?

Is there any risk with doing this?  i.e. Could there be some code change or anything else that might happen in that time period which would mean my wallet is incompatible with the bitcoin network?