It could have fallen apart after Eccleston left, but Piper and Tennant had a different kind of chemistry, one that worked for the changing relationship of the Doctor and Rose and kept it going beautifully.
You know, I thought it would fall apart and although I'd only been a casual viewer during S1, by the end of PotW, I was quite deflated because I really thought that the relationship that got me interested in the first place, couldn't possibly survive a regeneration... Needless to say, I was pleasantly surprised. As you say, the relationship shifted; S1 was all super-hot UST but as soon as she accepted 10 as the Doctor, they both already knew they were in love with each other and what's more, they also knew how the other felt ('I thought you and me were...' and 'Oh, she knows...'). Hence they became more couple-y. I think the continuity across the 4 series is just incredible.
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You know, I thought it would fall apart and although I'd only been a casual viewer during S1, by the end of PotW, I was quite deflated because I really thought that the relationship that got me interested in the first place, couldn't possibly survive a regeneration... Needless to say, I was pleasantly surprised.
As you say, the relationship shifted; S1 was all super-hot UST but as soon as she accepted 10 as the Doctor, they both already knew they were in love with each other and what's more, they also knew how the other felt ('I thought you and me were...' and 'Oh, she knows...'). Hence they became more couple-y.
I think the continuity across the 4 series is just incredible.