OK so here's my own theory.
I need to be able to reconcile it with every single line of the poem. This may be problematic, but here goes.
The Lady of Shalott is Tennyson himself. Note the dates:
1832 The first version is published
1836 Tennyson is involved with Emily
1842 Second version is published
1849 Married Emily
You can see it clearly here. He's got this....er...curse of a disease, he goes into these...trances..he thinks he's epileptic...is he? Who knows? He feels he can't marry he can barely get about in public, he's got this problem...he can't pass it on to a new generation (I guess abstinence never occurred to him) he feels doomed by this curse of his disease but later by a whisper of a curse, isn't that interesting.
WHEN (this is vital for my theory) did the doctor say oh no, it's just gout? GOUT?
So he IS the Lady in the Tower. He's using the metaphor of Camelot, and Lancelot, the two supposedly most pure (?) images of Chivalry. Something the Victorians were very familiar with but his has a twist. She's working away just like he did but she can't partake of life like he can't because she's cursed. Or wait, maybe it's not a curse..a whisper of a curse, we really need to know when the doctor told him this news..and the poem changes...are they related?
But he can't stand it. He must take a chance,
Or when the Moon was overhead,
Came two young lovers lately wed;
"I am half sick of shadows," said
The Lady of Shalott.
See it's not just Lancelot, it's life itself. He's lonely. He wants to partake of all the glittery stuff that everybody else has.
And here the poem is quite interesting. There are 4, count 'em, 4 paragraphs of description here after the two lovers. Here comes Lancelot. He's shining, he's jingling, he's singing, he is the very representation of LIFE, the life that despite the fact she is happy in the bower with her creativity, she longs for but fears (because of HIS curse of trances) he can never have but....
She left the web, she left the loom,
She made three paces through the room,
She saw the water-lily bloom,
She saw the helmet and the plume,
She look'd down to Camelot.
Out flew the web and floated wide;
The mirror crack'd from side to side;
"The curse is come upon me," cried
The Lady of Shalott.
Is he saying here (this is before he married) that he dare not try, because if he DID he would bring doom?
I think he is. He wrote the poem apparently before the doctor lifted the curse of Epilepsy.. Everything in my theory hinges on the doctor.
This is my little theory. It may not hold up. I need to go back and take every line and see if it fits. It may not.
The isolation does, the curse does, the metaphor does....It's not the same as the one his son put forward, but I really do think this is what it IS. I think his son is correct that the Lady is Tennyson, not so much as Artiste and Work, but as the person.
He's used the motif of Camelot and he's put himself (The Lady) in an ivory tower from fear and he can explain it so well because he's living it when he wrote it. Poor miserable man. That's why Lancelot is different at the end of the 2nd version: there's hope after all. But he/she dies in the poem (he'd given up) before in real life he found the world did not end when he took the chance, note the dates again....perhaps a third revision would have cleared up the issue. How clever of him to use the Camelot, maid in a boat image, nobody would ever dream it was he.
Now THAT'S my theory and so far it fits, except for that pesky line of Jonathan's, what do you think? Does it fit with yours or is it way off the beam?
One of Lancelot's jingling bells for your thoughts.