I've asked this question to myself a lot and I give different answers, but being in the position of Dan it might be difficult to choose between Creddie or Seddie, because either way a major part of the fanbase will abandon the series, so in what way can Dan please both (or neither) Creddiers and Seddiers. I already got two plots to start brainstorming:
1) Carly and Sam both proclaim their love to Freddie and Freddie doesn't know who to choose so the three decide that both Carly and Sam will date Freddie for half a season and then Freddie decides who he'll date.
2) Carly and Sam fight over Freddie so Freddie decides to leave and falls in love with another girl. Carly and Sam cooperate to sabotage Freddie's date.
So what do you think?