I already miss him but the game creators will miss him even more, I guess. It won't be easy to replace him. I hope they take the time they need for the next season of the game. I really want to play it but I prefer to wait a little longer and get something really good than to get a new game right away with some idiot as the main character and some rushed story behind. After what they did, some people may even have some high expectations for next season. I would prefer more action and less talk (well...as a non-english speaker it would be nice

) and that would help forgetting Lee a bit. I don't think it will be easy to come up with a new story and create a relation such as Lee-Clementine and even with some others so easily as in this season. We must also have in mind that if the story begins after this one, the world will be a worst place, the people will trust less each other and relations will be harder to build on (it doesn't have to be; could be a different story with other characters the day the plague started to expand). Neverthless I think a bit more action would disguise a bit the emotional part, which I doubt it can be as strong as this first season.
Oh..and Lee is one of my favourite game characters ever, no doubt.