I'll never watch them like that. I'll definitely keep watching online. If after season 2 I'm dissatisfied I'll decide whether to give it more time but even so I will not keep up with it while its airing on the regular network.
The episodes will only air once a week once the new season starts. Hopefully they actually show them in complete succession.
Thinking about it now, Season 1 was my favorite too. Season 4 wasn't as good although the flashforwards were interesting. I think Season 5 and 6 are going to be insane though.