Why not a reconnect function?

The idea just hit me while I watched Stephano v Polt. If Blizzard won't add LAN support, why not integrate the ability to leave the game while dropped?

If you allowed 2 minutes on the ladder for a player to reconnect, crashes to desktop/peripheral malfunctions wouldn't cause ladder losses;

For tourney games, GSL et al, the connected player could simply not click the "drop" button in the pane, and their opponent would be able to reconnect to that game indefinitely, allowing reboots/PC changes etc.

Can anybody see any issues with this? Games like HoN and LoL already have this function if I'm not mistaken? Surely it couldn't be THAT complicated to implement.