Having just read an article by James Allen, I feel worried about a possible move to Mercedes for Lewis for 2013.  Using the expertise of Schumacher to help develop the team, then moving in Lewis to reap the benefits?  That's not right, and imagine if Ferrari had done that for the 2000 season. 
Obviously this is just speculation but it will make watching Schumis races horrendously nerve shattering. 
Hopefully McLaren will be ultra competitive and Lewis won't want to snaffle up anyone's seat.